O LEVEL 1
04
What effect does biodiversity have on a
community?
A. It enables species to survive in a desert
B. It enables the community to withstand
changes
C. It makes destruction by insects impossible
D. It makes primary succession more likely
Answer:
d
Explanation:
Biodiversity is what the trees and the animals live on so they need it to survive.
Answer soon a possible please!
Bacteria in the soil can release____
back into the air
-oxygen
-hydrogen
-nitrogen
-carbon dioxide
Answer:
Explanation:
nitrogen
Answer:
nitrogen
Explanation:
An increase in stimuli to the brain results in an increase in the responses of an organism. TRUE OR FALSE?
Answer:
True
Explanation:
As the intensity of stimulus increases abruptly then response increase in continuous as different absolute intensities. In fact the brain is able to respond to the differential change in magnitude of stimuli and not the absolute change in magnitude.
Hence, the given statement is true
which is the method of estimating fish in a pond
Explanation:
There is a popular sampling method called capture – recapture or 'Lincoln Index' or 'Pieterson's Method' which is used to estimate the size of an animal or human population.
help
how are electromagnetic waves and mechanical waves the same?
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good answers only, if your answer is good and your the first to answer you get brainlyest
Answer:
Both electromagnetic and mechanical waves are the movement of energy. They can be measured in the same ways too. The amplitude, frequency, and wavelength are ways to represent the measurements of waves. Additionally, they both have crests and troughs. Finally, both can be reflected, absorbed, or transmitted.
In addition to stealing energy
from the host, how can parasites
cause problems for their hosts?
Answer:
They can cause the deprivation of nutrients, fluids, and metabolites. this may also cause pathological effects in their hosts such as pathogenic effects.
Which of the following is the best example of a neutral mutation?
A) A mutation that causes a rabbit that lives in the Arctic to have black fur
B) A mutation in a squirrel that causes it’s tail to not be as bushy and full
C) A mutation that caused a plants to develop a waxy coating which helps it retain water in its cells
D) A mutation in corn that causes it to not be able to produce chlorophyll and photosynthesize
Answer:
It's A.
Explanation:
The cell cycle is the life of the cell from the time it is first formed from a dividing parent cell until its own division into two cells
Explanation:
cell cycle is made up of three main parts: interphase, mitosis, and cytokinesis. Most biologists agree that interphase makes up the period of time that a cell would be preparing for cell division. Cells spend the majority of their lives in this stage. During interphase a cell is going to be growing, replicating its genetic material and essentials to carry out cell division, and proofreading the genetic material to ensure replication has occurred correctly. This doesn’t sound like much, but it’s actually the longest part of the cell cycle. Once this is complete, the cell will then go through cell division and, theoretically, split into two new cells (cytokinesis).
How cytokinesis works will depend upon the type of cell that is dividing. Here is an image that summarizes the differences in cytokinesis in plant cells and animal cells, which is the classic example used in many introductory biology courses:
What are the characteristics of saturated fatty acids? Check all that apply. Each carbon atom in the carboxylic acid chain is bonded to at least two hydrogen atoms. At least one double bond links carbon atoms in the carboxylic acid chain. The lipid is a straight chain. The lipid is a liquid at room temperature. The lipid is a solid at room temperature.
Each carbon atom in the carboxylic acid chain is bonded to at least two hydrogen atoms and The lipid is a solid at room temperature are the characteristics of saturated fatty acids.
Where are saturated fatty acids found?
Although plant foods like coconut, coconut oil, palm oil, and palm kernel oil are high in saturated fats, saturated fat is mostly found in animal meals. However, replacing saturated fat with refined carbs will probably negate the benefits of cutting back on saturated fat.
No carbon-to-carbon double bonds can be found in saturated fatty acids, while one can be found in monounsaturated fatty acids and two or more can be found in polyunsaturated fatty acids. Since there are enough hydrogen atoms in the saturated fatty acid molecule, every carbon atom is single-bonded. A carbon atom at the end of a chain of saturated fatty acids is doubly linked to an oxygen atom and singly bonded to a hydroxyl group.
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Answer:
1, 3, 5
Explanation:
I just answered it, and I got it right
What is the chemical equation for photosynthesis
Answer:
6CO2 + 6H2O --> C6H12O6 + 6O2
Explanation:
Have a good day :)
Answer:
6CO2 + 6H2O → C6H12O6 + 6O2
Explanation:
hope that helps girly good luck!
What happens if the sequence is changed (mutations)?
Explanation:
A mutation may change a trait in a way that may even be helpful, such as enabling an organism to better adapt to its environment. The simplest mutation is a point mutation. This occurs when one nucleotide base is substituted for another in a DNA sequence. The change can cause the wrong amino acid to be produced.
____________________________ is the process in which humans chose the desired traits of an organism.
a
Artificial selection
b
Natural selection
c
Biology
d
Variation
Ecologists have found that dense populations of organisms have lower birth rates, higher death rates, and slower growth rates than less dense populations. Which best explains these findings?
A
interactions between predator and prey
B
natural environmental disturbances
C
unusual weather changes
D
stressors from competition for resources
‼️‼️‼️
Please helppp
Answer:
“Hard limits” to population growth are things like food, water, energy, technology, living space, other basic needs and economic factors which limit people’s ability to access these things.
“Soft limits” to population growth are things like education, birth control, the desire for a better life individually and a better global future for humanity, religious celibacy or chastity or abstinence, female empowerment and economic participation, the suffering already caused by overpopulation and the desire to avoid further suffering, malnutrition or non-lethal starvation which reduces sexual libido, pollution and other man made causes of involuntary sterility or low sperm count or low fertility, desire to save the environment, aversion to pain and suffering when understood that population growth causes both.
Countries with better quality of life and access to food and basic needs often have lower birth rates and lower population growth. This shows that soft limits can actually be more effective than hard limits to stop population growth. You have plenty of countries in Africa running into hard limits and having some of the highest fertility and population growth rates at the same time. They also suffer massive problems like war, poverty, disease and low standard of living. This goes to show that running into the hard limits will pretty much let things get as bad as they can get before it stops population growth. The hard limits won’t stop all the suffering caused by overpopulation but will make enough people suffer TO DEATH that the population doesn’t grow. People fear pain, thus the soft limits are more effective when they understand that population growth was responsible for pain or suffering and avoid it.
Look at picture
People may remove fallen trees from Forrest's to reduce the fire risk removing the trees is now thought to have an impact on the health of the forest. Which impact would removing fallen trees from forests most likely have on forest health?
Answer:
C
Explanation:
Without decaying wood , the nutrient cycle is unbalanced
Decreased soil fertility by preventing nutrient recycling. Therefore, option (C) is correct.
What is nutrient recycling?Nutrient recycling is the process by which essential nutrients, such as carbon, nitrogen, phosphorus, and sulfur, are continuously cycled through the biotic and abiotic components of an ecosystem. This cycle involves the movement of nutrients from the non-living (abiotic) to the living (biotic) components of an ecosystem and back to the non-living components.
The process of nutrient recycling involves the decomposition of dead organic matter by microorganisms and the subsequent release of nutrients into the soil, water, and air. These nutrients are then taken up by plants and other organisms, which are eventually consumed by other organisms in the food chain. When these organisms die or produce waste, the nutrients are again released into the environment to be used again.
Nutrient recycling is crucial for the maintenance of healthy ecosystems and the sustainability of life on Earth.
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in your own words, write the definition for Ribosomes (what does it do and what type of RNA is it made of?)
Answer:
Ribosomes are structures made of rRNA and proteins. They are the site of protein synthesis (where mRNA and tRNA meet).
Explanation:
Which of the following best describes what carrying capacity is?
A
The quantity of marine life a limited water resource can sustain.
B
The maximum number of a population that an ecosystem can sustain.
C
The total amount of greenhouse gases a specific ecosystem can sustain.
D
The minimum number of predators a specific geographic area needs to sustain itself.
B. The maximum number of a population that an ecosystem can sustain.
Apply what you know about lipids to explain why the cuticle helps prevent water loss in plants. Compare it to what humans do.
Answer:
Explanation:
Waxy cuticle is a white powdery substance that is insoluble, it is found usually on the surface of stem or leave and it prevent excessive loss of water through transpiration.
It is an adaptive mechanism used in dry areas or desert to help plants retain water that is needed for their growth by reducing amount of water loss through transpiration.
Cactus is an example of plant with cuticle that thrive well in dry areas
Help please I will mark brainlist!!
Answer: i think the answer c
Explanation:
Which of the following is NOT part of the first line in immune defense? *
Mucus
Sweat
Tears
Antibodies
Skin
Answer:
Antibodies
Explanation:
Skin, tears, sweat and mucus, are all first line of defense.
The part that is not the first line of immune defense is antibodies. The correct option is d.
What are antibodies?
The immune system is a bodily system that consists of white blood cells and antibodies that aid in the fight against any external invaders or infections that enter the body.
They are the body's defense mechanism. Antibodies recognize the pathogen and assist your body in combating it. These antibodies are produced by your body's immunological system. Everyone possesses a variety of antibodies. Each of them detects intruders, such as viruses and bacteria, that might cause illness.
An antibody is a protein that the body's immune system produces when it recognizes dangerous chemicals known as antigens. Microorganisms (bacteria, fungi, parasites, and viruses) and chemicals are examples of antigens.
Therefore, the correct option is d, Antibodies.
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how the animals and plants of a healthy ecosystem are organized and interact.
Answer:
A healthy ecosystem consists of native plant and animal populations interacting in balance with each other and nonliving things (for example, water and rocks). ... Decomposers break down dead plants and animals, returning vital nutrients to the soil. Plants take up these nutrients, along with water, through their roots.
Explanation:
The 1918 influenza epidemic killed between 50 million and 100 million people worldwide. This epidemic happened near the end of World War I. More people died from the influenza epidemic than were killed in the war. Which of the following explains why this virus was so deadly worldwide?
A. Infected soldiers returning from the war spread the virus when they coughed
B. Medical personnel often became ill as a result of exposure to airborne virus particles.
C. Food was scarce because of the war, so people were undernourished, and their immune systems were weakened.
D. All of the above.
Answer:
D
Explanation:
A 38-year-old mother of three presents to her primary care office with complaints of fatigue. She feels that her energy level has been low for the past 3 months. She was previously healthy and taking no medications. She does report that she has gained about 10 lb and has severe constipation, for which she has been taking a number of laxatives. A TSH is elevated at 25 mU/L. Free T4 is low. She is wondering why she has hypothyroidism. Which of the following tests is most likely to diagnose the etiology?
A. Antithyroid peroxidase antibody
B. Antithyroglobulin antibody
C. Radioiodine uptake scan
D. Serum thyroglobulin level
E. Thyroid ultrasound
Answer:
A. Antithyroid peroxidase antibody
Explanation:
The most common cause of hypothyroidism is autoimmune thyroiditis, also known as chronic lymphocytic thyroiditis or Hashimoto's disease. This condition (autoimmune thyroiditis) is caused by damage of the thyroid gland, which occurs when antibodies of the immune system attack this gland. The thyroid peroxidase test is an enzyme immunoassay widely used to measure the level of autoantibodies against thyroid peroxidase. Patients with chronic thyroiditis often display a positive thyroid peroxidase test. On the other hand, thyroid ultrasound is useful for the initial evaluation of painless thyroiditis in order to distinguish nodules or multinodular goiter. Antithyroid peroxidase antibodies are commonly observed in individuals suffering autoimmune thyroiditis, whereas antithyroglobulin antibodies are observed in different thyroid disorders and autoimmune diseases. Finally, a radioiodine uptake scan measures the amount of radioactive iodine accumulated in the thyroid gland, which is useful only for diagnosing early‐stage of Hashimoto's thyroiditis.
Organisms of either extreme characteristic dying out while organisms with the medium characteristic have a higher fitness is identified as?
Answer: Stabilization selection
Explanation:
Natural selection involves the differential survival and growth of organisms which have suitable traits to survive in unfavorable or adverse environment. Such traits are passed on to the next generation. Stabilization selection is a type of natural selection in which the nature selects the non-extreme phenotypic traits. Middle traits are selected and such organisms grow and reproduce. Example can be given that of human babies in which babies with low weight lose more heat and babies with high weight are difficult to be delivered from the pelvis. Therefore, babies with middle weight are expected to survive more than that of low or middle weight.
Assuming that the Earth has a gravity of 1 and Jupiter has a gravity of 2.9, what would your weight be on Earth if you weighed 300 lbs on Jupiter?
Answer:
300/2.9 = x/1
300*1 = 2.9x
300 = 2.9x
103.448275862 lbs = x
Explanation:
The female gametes are called__________. *
sperm
ova
Answer:
Woman's gametes are called Ova. Sperm is what a mans gamete is.
Explanation:
Please help me with this!!
1. Which process plays a part in genetic recombination? A. Asexual reproduction. B. Cytokines. C. Independent assortment. D. Mitotic division.
2. Which correctly lists the following terms in order from smallest to largest? DNA, chromatin, chromosomes, nucleosomes.
A. Chromatin, DNA, Chromatin, nucleosomes
B. Chromosomes,DNA, Chromatin, nucleosomes
C.DNA, nucleosomes, chromatin, chromosomes
D. Nucleosomes, DNA, chromatin, chromosomes
3. In a triploid organism, how many alleles are present for each gene per cell?
A. 1
B. 3
C. 6
D. 9
I) Independent assortment.
II) Nucleosomes, DNA, chromatin, chromosomes.
III) 3.
EXPLANATION:➻ Recombination scrambles pieces of maternal and paternal genes, which ensures that genes assort independently from one another.
➻ We know that Chromatin is a complex of DNA and proteins that forms chromosomes. Chromatin looks like beads on a string. The beads are called nucleosomes. Each nucleosome is composed of DNA.
➻ Triploids with three different alleles can easily be detected because they have a unique phenotype.
The process involved in genetic recombination is INDEPENDENT ASSORTMENT. The correct order from smallest to largest is DNA, nucleosomes, chromatin, chromosomes. In a triploid organism, there are 3 ALLELES for each gene.
In independent assortment, different gene variants or 'alleles' are independently and randomly assorted into daughter cells, which allows genetic recombination.
In eukaryotic organisms, DNA is associated with histone proteins in order to form nucleosomes, which arrange in higher organization structures called chromatin fibers.
Subsequently, chromatin fibers condense to form structures called chromosomes.
A triploid organism (3n) contains three sets of homo-logous chromosomes, each one containing one allele for a given locus.
In conclusion, the process involved in genetic recombination is INDEPENDENT ASSORTMENT. The correct order from smallest to largest is DNA, nucleosomes, chromatin, chromosomes. In a triploid organism, there are 3 ALLELES for each gene per cell.
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True or false, DNA contains the nitrogenous bases adenine , uracil, guanine, and cytosine.
Answer:
True
Explanation:
Trust
What Are Alleles? Where Do alleles come from?
Answer:
An allele is one of two more versions of a gene. An individual inherits two alleles for each gene,one for each parent.
Explanation:
Part-1
An allele is a variant form of a gene. Though the term allele was originally used to describe variation among genes, it now also refers to variation among non-coding DNA sequences.
For example: an allele is the gene that determines hair color.
Part-2
One allele for every gene in an organism is inherited from each of that organism's parents.
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Estupefacientes o psicotrópicas productoras de dependencia física o síquica, capaces de provocar graves efectos tóxicos o daños considerables a la salud." Esta definición corresponde a: *
Answer:
Drogas.
Explanation:
Las drogas son sustancias que tienen un efecto modificatorio sobre el estado normal de la psique. Por tanto, estas sustancias influyen en el comportamiento o la experiencia del usuario, pudiendo tener un efecto alucinógeno, pero también sedantes o una mixtura entre ambos.
El término se usa generalmente para indicar sustancias que tienen un efecto muy fuerte (por ejemplo, heroína, cannabis, mescalina, alcohol). Aunque los estimulantes cotidianos como el café y el chocolate también pueden tener un efecto en la psique, generalmente no se clasifican como sustancias psicoactivas debido a su efecto relativamente leve.
Los medicamentos que tienen un efecto sobre la psique se denominan psicofármacos. No obstante, los medicamentos que no se clasifican principalmente como psicofármacos, como los antihistamínicos, los agentes anti-mareo y los betabloqueantes, pueden también tener un efecto psicotrópico.