Answer:
Natural selection
Explanation:
Microevolution refers to changes produced at a lower level than species. In genetics, microevolution is the change in the allelic frequency perceptible in a few generations. Most of these naturally produced changes by mutation, natural selection, genetic flux, genetic drift.
After the drought on Daphne Major, many of the plants producing small-sized seeds decreased their reproductive rate drastically. Consequently, there were almost no seeds available for the medium ground finch to feed. The population of this species also decreased to only a hundred birds over two years. Weather conditions and food availability influenced the survival of the animals.
With time, the finched population increased again, but now, the average size of the beaks was larger. The trait modification was related to the availability of only larger seeds with thick husks.
Eating large seeds with medium or small-sized beaks was impossible, so Finches needed to adapt, developing larger beaks to crack open the husks and eat the contents of the seeds.
Natural selection was responsible for the rapid change in the finches´ population beaks size after the drought. The evolutive force modifies the allelic frequencies, increasing the frequency of genetic variants that expressed the larger beak size and declining the frequency of the alleles that expressed smaller beak size.
Please Help- Which of the following conclusions would be best supported by the fossil record?
Rocks can destroy trees.
Animals need leafy tees.
Trees give off oxygen.
The environment has changed.
Answer:
D
Explanation:
Why is cloning embryonic stem cells a “holy grail” for scientists?
A-It will allow scientists to clone people.
B-It can help scientists understand diseases.
C-It will allow scientists to raise the specter of controversy
D-It will allow scientists to make personalized medicine.
Answer:
The answer is D) It will allow scientists to make personalized medicine.
Explanation:
I used the context of the article where they stated "So for years, scientists have been trying to use cloning techniques to make embryonic stem cells that are essentially a genetic match for patients. The idea is that such a close match would prevent their bodies from rejecting the cells."
Cloning embryonic stem cells is a “holy grail” for scientists because it will allow scientists to make personalized medicine.
What is Cloning?
This is the process which involves making exact genetic copies of a living organism.
Cloning embryonic cells will ensure that scientists are able to make personalized medicine as we have unique genetic makeup thereby making option D the most appropriate choice.
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14. In one to two sentences, what are some ways to mitigate climate change?
altruistic behavior
Answer:
The North produced 17 times more cotton and woolen textiles than the South, 30 times more leather goods, 20 times more pig iron, and 32 times more firearms. The North produced 3,200 firearms to every 100 produced in the South.
Explanation:
A probability of 1/4 is equal to a probability of 75%
True or False
What is natural selection?
- A prodded that selects variations that help with survival and that spreads the variations to more offspring
-A process through which nature select an individual within a population for extinction
-A process that causes all populations to gradually increase in size
-A process that causes random variations to appear in the offspring of every generation
A process that selects for variations in a population that help with survival and that spreads the variations to more offspring.
Water vapor in the air releases heat and condenses into rain droplets is an example of an_____ reaction.
1. Endothermic
2. Exothermic
Answer:
I think it's exothermic
Answer:
endothermic reaction is when air releases heat and converts water into water vapour but exoteric is when water vapour gets converted into rain droplets!
Explanation:
endothermic is taking in heat and exothermic is giving out heat so when water takes in heat it became water vapour and so its endothermic but water vapour gives out heat causing exotehrmic reaction!
HOPE IT HELPS!!!
3. Label the parts of the digestive system on the image below by typing in the organ name next to the corresponding letter.
Answer:
A. Salivary Gland (I believe)
B. Esophagus
C. Liver
D. Stomach
E. Pancreas
F. Small intestine
G. Large Intestine
Based on the living things in the pyramid, please tell me what examples would fit into these categories:
Primary Producers, primary consumers, secondary consumers, and tertiary consumers.
Answer:
Primary producer = Oak tree leaves
Primary consumer = Caterpillars
Secondary consumer = Blue j a y s
Tertiary consumers = Hawk
Explanation:
An energy pyramid is a graph which shows how energy is transferred or flows from one trophic level to the next. Organisms which occupy the same level in the food chain within an ecosystem belong to the same trophic level.
The shape of an an energy pyramid is a pyramid indicating that the number of living things as well as the amount of energy flow decreases as one goes from one lower trophic level to the next higher level.
At the base of the pyramid are the primary producers which use energy of the sunlight to manufacture their own food. Example is the Oak tree.
The next higher level is the primary consumers who feed directly on the primary producers. For example caterpillars.
The next higher level is the secondary consumers who feed on the primary consumers. For example the Blue j a y s.
The highest levelin the pyramid is the tertiary consumers who feed on the secondary consumers. For example, the hawk.
2. The excretory system consists of:
Answer: The excretory system is largely associated with the urinary, or renal, system. This system consists of various organs that produce and then excrete the urine out of the body: the kidneys, ureters, the bladder, and the urethra. They include the kidneys, large intestine, liver, skin, and lungs. The kidneys filter blood and form urine. They are part of the urinary system, which also includes the ureters, bladder, and urethra. Each kidney has more than a million nephrons, which are the structural and functional units of the kidney.
Explanation:
In which direction will water move?
A. hypertonic to hypotonic
B. hypotonic to hypertonic
Answer:
A.
Explanation:
hypertonic- Higher solute in solution than in cell
Hypotonic- Lower solute in solution than in cell
Answer:
B. hypotonic to hypertonic
Explanation:
Hope this helps
What does aerobic respiration require?
Answer:
Aerobic respiration requires oxygen.
Which of the following can be multicellular?
A. eukaryotes
B. prokaryotes
Answer:
A Eukaryotes
Explanation:
thus would include plants, and animals
how many inches of rain is to be expected in the Temperate forest biome per year?
A:10-23
B:11-27
C:12-35
D:17-40
In what kind of star system does one star sometimes block the light from another?
1. Open Cluster
2. Globular cluster
3. quasar cluster
4. eclipsing binary
5. Which climate type forms the thickest soil the quickest?
PLEASE HELP ITS URGENT What is the functionof the peripheral nervous system? A. To transmit signals between the body and the brain or spinal cord B. To transmit signals related to movement of the hands and feet C.To transport blood to the brain D. To transport oxygen and nutrients throughout the body
Answer:
The peripheral nervous system (PNS) is one of the two components of the nervous system, the other part is the central nervous system (CNS). The PNS consists of the nerves and ganglia outside the brain and spinal cord.[1] The main function of the PNS is to connect the CNS to the limbs and organs, essentially serving as a relay between the brain and spinal cord and the rest of the body.[2] Unlike the CNS, the PNS is not protected by the vertebral column and skull, or by the blood–brain barrier, which leaves it exposed to toxins and mechanical injuries. The peripheral nervous system is divided into the somatic nervous system and the autonomic nervous system. In the somatic nervous system, the cranial nerves are part of the PNS with the exception of the optic nerve(cranial nerve II), along with the retina. The second cranial nerve is not a true peripheral nerve but a tract of the diencephalon.[3]Cranial nerve ganglia originated in the CNS. However, the remaining ten cranial nerve axons extend beyond the brain and are therefore considered part of the PNS.[4] The autonomic nervous system is an involuntary control of smooth muscle and glands. The connection between CNS and organs allows the system to be in two different functional states: sympathetic and parasympathetic
Explanation:
A researcher studied the development of resistance to antibiotics by bacteria. She studied several antibiotics to determine how long it took for bacteria to develop resistance. She found that, on average, it took eight years for bacteria to develop resistance to an antibiotic. In some cases, bacteria developed resistance to an antibiotic within a year, and none of the antibiotics were still completely effective on bacteria after 30 years.
How is this possible?
Answer:
See Explanation
Explanation:
Antibiotic resistance is said to have occurred when a given antibiotic drug is no longer effective against the target organisms. This is as a result of genetic mutation in the organism that enable resistance to the drug.
When a drug is being used against a particular organism, the organism gradually develops genetic mutations that helps it to inactivate the antibiotic drug and increase its chances of survival. These traits are passed on to offspring, hence the onset of resistance to antibiotic drugs.
There are different mechanisms of antibiotic resistance which include; Degrading the antibiotic drugs by the use of enzymes secreted by the organism, altering proteins present in the organism upon which the antibiotic drug acts and changing membrane permeability to antibiotic drugs.
TELL ALL THREE ANSWERS FOR BRAINLIEST!
What do supernova remnant and planetary nebulae have in common? Select the three correct answers.
A. They are diffuse.
B. They are composed of matter from dying stars.
C. They emit non-visible radiation.
D. They are composed only of hydrogen and helium.
E. They have planets circling them.
F. They contribute matter to interstellar space.
Supernova remnant and planetary nebulae have ; ( B, C, F ) in common
They are composed of matter from dying stars ( B )They emit non-visible radiation ( C )They contribute matter to interstellar space ( F )Supernova remnant is a by product gotten from the explosion of star(s) in the galaxy ( supernova galaxy ). which is bounded by a shock waves and contains materials emanating from the explosion of star(s)
A Planetary nebulae looks like a planet when viewed through a small telescope. but it is actually a bright shell of hot gas continuously expanding. and it is a by product of the breaking down of a star(s) life ( usually low-mass star )
Therefore we can conclude that the similarities between a supernova remnant and a planetary nebulae is that They are composed of matter from dying stars ,They emit non-visible radiation, They contribute matter to interstellar space
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A mutation in a gene results in an animal that cannot make a protein that allows muscles to contract which of these is most likely to happen
Answer:
it will get weaker give water
Explanation:
feed it bread
A heritable change in a person's genetic makeup is referred to as a mutation. Changes can be substantial or negligible. Chromosomes or chromosome parts may be lost, added, duplicated, or rearranged in significant alterations. Thus, option B is correct.
What mutation in a gene results in an animal?High-energy sources like radiation or chemicals in the environment can both result in mutations. They may also emerge on their own during DNA replication. The two main kinds of mutations are chromosomal abnormalities and point mutations.
Mutations can alter an organism's phenotype, which is its outward appearance, or they can have an impact on the way DNA encodes the genetic information (genotype). When mutations happen, they might kill an organism completely or only partially.
The likelihood that a gene mutation will cause an animal to be unable to produce the protein necessary for muscles to contract is that the animal will perish before producing any progeny.
Therefore, The animal will die before having any offspring.
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The above given question is incomplete. The complete question is given below:
A mutation in a gene results in an animal that cannot make a protein that allows muscles to contract. Which of these is most likely to happen? * A. The gene will eventually be found in all animals of the species. B. The animal will die before having any offspring. C. The gene will change back to the normal form. D. The animal will pass this gene on to many offspring.
distinguish between plant and animal cell
Plant cells have a cell wall, but animals cells do not. Cell walls provide support and give shape to plants. Plant cells have chloroplasts, but animal cells do not
Explanation:
hope this helps
How many acres of wood is logged annually?
A:10 thousand hectares
B:100 thousand hectares
C:1 million hectares
D:10 million hectares
Answer:
C
Explanation:
Which statement describes characteristics of planarians?
They live in freshwater, are free-living, and reproduce sexually and asexually.
Most planarians are found in freshwater. Since they reproduce through fission, they reproduce asexually. However, since they are heteromorphic, they also reproduce sexually.
Help Me please ASAP!!!!!!!!!
Answer:
the answer is 3 and that's it
During the development of an embryo, cells usually undergo a certain process. In this process, cells are fixed in development and become specialized to perform specific functions. What is this process called?
Answer:
Cell differentiation.
Explanation:
This is because cell differentiation refer to the process where cell changes from one cell types to tissues or organs or even system or specialised cells during a developmental stages to perform functions. It occur in multicellular organisms where zygote changes to tissues or system.
. This occurs through a process called gene expression. Gene expression refer to the combination of genes that can either be expressed or repressed.
9. The nitrogen cycle relies on various organisms carrying out very specific 7 points
functions. One vital group is the nitrogen-fixing bacteria. Which of the
following explains how the nitrogen cycle would be disrupted if there were
a sudden population explosion of nitrogen-fixing bacteria? *
A. A population explosion of nitrogen-fixing bacteria would lead to a decrease in
ammonium levels in the water, which will cause the water to become very acidic.
B. A population explosion of nitrogen-fixing bacteria would cause dissolved nitrogen
levels in the water to increase
C. A population explosion of nitrogen-fixing bacteria would cause dissolved oxygen
and dissolved carbon dioxide levels to decrease.
D. A population explosion of nitrogen-fixing bacteria would cause ammonia levels to
rise, which can be detected by testing the ammonia levels in the water.
Answer:
B. A population explosion of nitrogen-fixing bacteria would cause dissolved nitrogen
levels in the water to increase.
A population explosion of nitrogen-fixing bacteria would cause dissolved nitrogen levels in the water to increase. The correct option is B.
What are nitrogen-fixing bacteria?Prokaryotic microorganisms called nitrogen-fixing bacteria are able to convert atmospheric nitrogen gas into "fixed nitrogen" molecules like ammonia that plants may use.
The purpose of nitrogen-fixing bacteria is to provide plants with a crucial nutrient that they are unable to receive naturally from the air.
Microorganisms that fix nitrogen can obtain assimilative N for plants in a way that crops cannot. It is absorbed by bacteria from the atmosphere as a gas and released to the soil, mostly as ammonia.
If nitrogen-fixing bacteria suddenly went through a population explosion, the nitrogen cycle would be interrupted since this would result in higher levels of dissolved nitrogen in the water.
Thus, the correct option is B.
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Students watch a cartoon and then rated how funny they thought the cartoon was
Answer:
What's the question? Looks incomplete
16.
What term collectively describes the following substances: thickeners, colourings, flavourings and
dyes?
Food additive is term that collectively describes thickeners, colourings, flavourings and dyes.
What are food additives?"Food additives are substances added to food to preserve flavour or enhance taste, appearance, or other sensory qualities."Sugar, salt, vinegar, etc. helps in preservation of food.What are thickeners?"Thickeners are substances which increases viscosity of liquid. Examples: corn-starch, wheat flour, etc."Hence, the term collectively describing the substances: thickeners, colourings, flavourings and dyes is known as food additive.
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What is the difference between an adaptation and when an organism adapts? Give an example to illustrate the difference.
Answer:
Natural selection is the mechanism that drives the evolution of adaptations. ... The difference between adaptation and natural selection is that adaptation is the characteristic while natural selection is the mechanism that increases the probability that an advantageous characteristic is passed on and becomes commonplace
Explanation:
Answer:
snosowsjbsojokkzjsojwki iwksbsok
What are the 4 steps of mitosis? What occurs during each?
Explanation:
There are four stages of mitosis: prophase, metaphase, anaphase and telophase.1) Prophase: chromatin into chromosomes, the nuclear envelope break down, chromosomes attach to spindle fibres by their centromeres 2) Metaphase: chromosomes line up along the metaphase plate (centre of the cell) 3) Anaphase: sister chromatids are pulled to opposite poles of the cell 4) Telophase: nuclear envelope reforms, chromosomes unfold into chromatin, cytokinesis can begin The order of the stages of mitosis can be remembered using the mnemonic PMAT.
3 ways in which our atmosphere is not like a greenhouse
( HELP ME PLEASE)!!!!
Answer:
1.) The atmosphere is an open system, with heat energy always escaping to space. Unlike the glass it absorbs 95% of the UV in the creation of ozone. This sounds insignificant, but one scientist argues variation in the 5 percent is the cause of warming.
2.) There are no winds in a greenhouse. In the greenhouse and in the atmosphere energy is partly transferred from the heated surfaces through collision between air molecules (conduction). However, in the atmosphere a large portion of that heat is transported vertically by rising air currents (convection), and also horizontally by advection or commonly wind. There are no winds in a greenhouse.
3.) Heat reduction in a greenhouse requires a physical change with a vent to let LW escape or a screen to block SW entering. Clouds are nature’s screen. However, they can block SW and LW, such that we have little idea how clouds work to modify temperatures
Explanation:
The basic idea of a greenhouse is that sunlight or shortwave (SW) energy passes through the glass and heats surfaces. The surfaces radiate that heat as longwave (LW) energy or sensible heat (heat you can feel). LW cannot pass through the glass, so is trapped and raises the temperature in the greenhouse; the glass acts like a one-way valve. A greenhouse is a closed system because the heat cannot escape unless artificially changed by opening vents or blocking sunlight. The glass supposedly represents the entire atmosphere. It also blocks 100 percent of the ultraviolet (UV) portion of the sunlight.