Answer:
It was the sudden appearance (over a 10my period) of many different organisms, which occurred approx 540-548 mya. ... So it can be away from sources of oxygen, preventing microorganisms from decomposing the organism.
Which of these are components of DNA? Select five options.
deoxyribose sugar molecules
ribose sugar molecules
adenine
phosphate molecules
ribosome
cytosine
thymine
Answer:
deoxyribose sugar moleculesphosphate moleculescytosine thymineadenineAnswer:
phosphate
adenine
cytosine
thymine
deoxyribose sugar molecules
these are the components or dna
Explain what factors can lead to genetic
variation within a population.
Answer:
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
Hope this helped :)
The map shows the location of Earth's principal biomes.
Which abiotic factor in tropical forests do boreal forests lack?
Answer:
warm temperature
Explanation:
I cannot see the choices in your image. I can only see choice A, which is "soil."
"Abiotic factors" are part of the ecosystem that don't have life. However, they have an impact on the life of the biotic factors (living organisms) in the environment. Examples of abiotic factors are: sunlight, temperature, climate, soil, humidity, wind, etc.
"Boreal forests" are abundant on the Earth's Northern Hemisphere. The climate here is generally cold, which doesn't allow some trees to survive. It is totally opposite to the warm temperature and high humidity that you can feel in the "tropical forests." Such factors allow many plants and animals to survive.
Clearly, the boreal forests lack the "warm temperature" that the tropical forests have.
Particles of gas is widely seperated
True
False
Answer and I will give you brainiliest
I think
Explanation:
true is right ans
Answer:
True
Explanation:
Will give brainliest
Which of your plants was a dicot? Which was a monocot? How could you tell?
PLANTS :
Sunflower
Pansies
HYdrangeas
Answer: Sunflower : Dicot, Pansies : Dicot, Hydrangeas: Monocots.
Explanation:
Within the plant kingdom, seed-bearing plants are divided into gymnosperms and angiosperms. Angiosperms are the group of plants that have flowers, within which we have monocotyledons and dicotyledons or eudicotyledons. A cotyledon is a leaf-like structure found on the seed so it is an embryonic leaf. Its function is to absorb nutrients in the seed until it develops true leaves that will allow to perform photosynthesis.
Monocotyledons are flowering plants whose seeds have one cotyledon. Dicotyledons are flowering plants whose seeds have two lateral cotyledons. Both monocot and dicot seeds have an embryo plant, a coat, and is able to store nutrients.
The true leaves monocots will be thin and long, while dicot leaves will be broad. Another characteristic is that the major veins of monocots are parallel and stripe-like while the dicot veins branch out. Also, monocots have flower parts in multiples of 3 while dicot flower parts are produced in multiples of 4 and 5. Roots in monocots sprout from many parts of the plant while dicot roots develop only from the radicle, which is the first part of a seedling to emerge during germination. This means monocots do not have secondary growth and dicots usually produce secondary growth.
Sunflower : Dicot, because it shows two cotyledons when the seed germinates.Pansies : Dicot, because it has 5 leaves. Hydrangeas: Monocots, they only have one cotyledon.Select the word or phrase that best completes each of the sentences below.
The smallest units of life are called
is the process of creating new living things.
is the phenomenon of living things responding to their environment
Answer:
1. CELL
2. REPRODUCTION
3. IRRITABILITY
Explanation:
1. All living organisms are composed of CELLS, which according to the cell theory as proposed in the 1800's is the smallest structural and functional unit of life.
2. REPRODUCTION is a characteristics possessed by all living things. It is the process whereby living organisms/things create new living things.
3. IRRITABILITY is another characteristics of living things, which is the process whereby living things respond to changes in their environment called STIMULUS e.g heat, nutrient stress e.t.c.
UNDERSTANDIN
Multiple Choice
5 Which of the following is a character-
istic of all animals?
a. asexual reproduction
b. producing their own food
c. having many specialized parts
d. being unable to move
Through the process of natural selection, favorable forms of genes are passed on more than other forms of genes.
A. True
B. False
which diagram A or B represents the plant cell
Answer:
the answer is a
Explanation:
i pretty sure
The unit discusses the problems with deforestation. What other problems could the extreme environmental damage caused by the kind of mining done in the Appalachians create?
I'm not sure if anyone can help me with this one, but if you can that'd be great! I have to write in the answer but I'm just looking for an idea. Thank you!
Answer:
Mining in the Appalachians has caused debris and harmful chemicals to land in the local waterways. The large amount of waste and dirt has also changed the course of the canals.
Explanation:
I took a majority of the information from a quiz prior to this assignment. I know that this is several days after you requested help but I hope that this helps you and other students!
During replication an exact copy of a DNA ____________ is produced.
Answer:
The replication process
Why would looking for the persons responsible for sneaking endangered species (rare birds, for example) into the United States be considered a job for a forensic scientist
Answer:
Forensic scientists are able to find the answer.
Explanation:
The persons responsible for sneaking endangered species into the United States be considered a job for a forensic scientist because forensic scientist is able to find out the persons. Forensic scientist are the investigators who collect evidences from the crime scene and leads to the person who commit crime. So the forensic scientist is the only person who find out the persons responsible for sneaking endangered species.
does humans produce two types of cells
Answer:
yes
Explanation:
they are :
somatic cellgerm cell(50 POINTS) Which of the following could be alive because it displays one of the signs of life? An object that _____.
A. has branches
B. does not move when touched
C. moves away from loud noises
D. makes noise
Answer:
A.
Explanation:
An object with branches
During World War I, the most important product of ABE fermentation was:
Glycerol
Acetone
Butanol
Ethanol
Answer:acetone
Explanation: ABE fermentation produces acetone, butanol and ethanol, but the most important product was acetone, used in cordite manufacture.
Carriers have to be what
genotype?
Answer:
What is the genotype of a carrier? The genotype of the carrier is Ff (one dominant non-disease gene, F, and one recessive, CF gene, f). Of course, any letter of the alphabet could be used as long as it is expressed as a heterozygous genotype.
a gorilla is an example of a producer, consumer, or decomposer?
Answer:
It would be A or B. I'd go with B.A gorilla is both a Producer and Consumer, since it can produce kids, and it can eat.
Some researchers estimate that the mutation rate for any given gene (or its DNA) in certain strains of bacteria is about 108. This means that one error or mutation in a given gene is introduced for every 100-million cell divisions. What can cause mistakes in replication
(60 POINTS) When an insect becomes trapped in a spider's web, the spider moves towards the insect. The spider could be alive because it displays
which sign of life?
A. information system
B. growth and development
C. response to environment
D. reproduction
Answer:
B. growth and development
Explanation:
im just guessing so i cant say for sure hope this helps tho
Answer:
B
Explanation:
Levels of Organization (Smallest to Largest)
Cell
Organ
Organism
Organ system
Tissue?
Answer:
cell,tissue,organ,organism,organ system
Explanation:
this is the correct level of organisation
6. What does eutrophication cause?
O A. A reduction in water pollution
O B. Increases in fish populations
O C. A new food source for birds
D. Toxic algae blooms
Answer:
d toxic algae blooms
Explanation:
because it is eutrophication
The diagram compares diffusion of sugar molecules and osmosis. Explain the difference between osmosis and diffusion in cells
Answer:
What is the difference between osmosis and diffusion? Osmosis is the movement of water molecules through the cell. Diffusion is the movement of molecules, such as oxygen, in and out of a cell. The process by which water molecules are able to diffuse through the cell membrane.
Explanation:
Diffusion and osmosis involves the movement of materials from one region another. The main difference between osmosis and diffusion is that osmosis requires a semi permeable membrane.
The movement of materials always occur in cells. This movement could occur by;
Active transportOsmosisdiffusionThe difference between osmosis and diffusion is that, diffusion does not involve a semi permeable membrane.
A semi permeable membrane is a membrane that is selectively permeable to materials. It allows some materials to pass and does not allow other materials to pass. We can see the semi permeable membrane as the structure in the osmosis diagram that separates the two regions.
Diffusion does not require the use of a semi permeable membrane.
Learn more:https://brainly.com/question/19867503
What the answer to this
which among the 7 theories on the origin of life would you
believed as true?
Answer:
Life on Earth began more than 3 billion years ago, evolving from the most basic of microbes into a dazzling array of complexity over time. But how did the first organisms on the only known home to life in the universe develop from the primordial soup?
One theory involved a "shocking" start. Another idea is utterly chilling. And one theory is out of this world!
Inside you'll learn just how mysterious this all is, as we reveal the different scientific theories on the origins of life on Earth. Electric sparks can generate amino acids and sugars from an atmosphere loaded with water, methane, ammonia and hydrogen, as was shown in the famous Miller-Urey experiment reported in 1953, suggesting that lightning might have helped create the key building blocks of life on Earth in its early days. Over millions of years, larger and more complex molecules could form. Although research since then has revealed the early atmosphere of Earth was actually hydrogen-poor, scientists have suggested that volcanic clouds in the early atmosphere might have held methane, ammonia and hydrogen and been filled with lightning as well.
The deep-sea vent theory suggests that life may have begun at submarine hydrothermal vents spewing key hydrogen-rich molecules. Their rocky nooks could then have concentrated these molecules together and provided mineral catalysts for critical reactions. Even now, these vents, rich in chemical and thermal energy, sustain vibrant ecosystems.
The next idea is a chilling thought. Read on!
Ice might have covered the oceans 3 billion years ago, as the sun was about a third less luminous than it is now, scientists say. This layer of ice, possibly hundreds of feet thick, might have protected fragile organic compounds in the water below from ultraviolet light and destruction from cosmic impacts. The cold might have also helped these molecules to survive longer, allowing key reactions to happen. [Related: The Ingredients of Life]
Understanding life’s origin may involve unravelling the mystery of DNA's formation, as we explain next.Nowadays DNA needs proteins in order to form, and proteins require DNA to form, so how could these have formed without each other? The answer may be RNA, which can store information like DNA, serve as an enzyme like proteins, and help create both DNA and proteins. Later DNA and proteins succeeded this "RNA world," because they are more efficient.
RNA still exists and performs several functions in organisms, including acting as an on-off switch for some genes. The question still remains how RNA got here in the first place. And while some scientists think the molecule could have spontaneously arisen on Earth, others say that was very unlikely to have happened. Other nucleic acids other than RNA have been suggested as well, such as the more esoteric PNA or TNA.
A study in 2015 suggests the missing link in this RNA puzzle may have been found.
Instead of developing from complex molecules such as RNA, life might have begun with smaller molecules interacting with each other in cycles of reactions. These might have been contained in simple capsules akin to cell membranes, and over time more complex molecules that performed these reactions better than the smaller ones could have evolved, scenarios dubbed "metabolism-first" models, as opposed to the "gene-first" model of the "RNA world" hypothesis.
The final theory is truly out of this world. Perhaps life did not begin on Earth at all, but was brought here from elsewhere in space, a notion known as panspermia. For instance, rocks regularly get blasted off Mars by cosmic impacts, and a number of Martian meteorites have been found on Earth that some researchers have controversially suggested brought microbes over here, potentially making us all Martians originally. Other scientists have even suggested that life might have hitchhiked on comets from other star systems. However, even if this concept were true, the question of how life began on Earth would then only change to how life began elsewhere in space.
Oh, and if you thought all that was mysterious, consider this: Scientists admit they don't even have a good definition of life!
Which three statements make up the law of gravity?
O A The strength of the gravitational force between two objects
decreases as the distance between their centers increases.
B. Matter attracts all other matter in the universe.
C. No matter where you are in the universe, you will always have the
same weight
D. The strength of the gravitational force between two objects
increases as the total mass of the objects increases
A, B and D
Explanation:
explain the concept of linkage. if you performed a test cross with a fruit fly that is heterozygous for two genes how could you conclude that the two genes are linked
Answer:
The correct answer would be - the ratio of phenotypes in an organism cross will tell if the genes are linked or not.
Explanation:
In this question, we perform a test cross with a fruit fly that is heterozygous If we perform a test cross between two parents with identical heterozygous genomes AaBb.
If there is no recombination found in the offspring of this cross it means there are no linkage of genes present. And if there are new or recombinant phenotypes present it means that there are genes linked together.
How did an earthquake cause this damage?
A. Water saturated the pavement.
B. Heat melted the minerals in the soil.
C. Pieces of the crust of Earth moved apart.
D. Liquid rock sank down under the crust of Earth.
Answer:
the correct answer is c(:
Cordite required ethanol.
O True
O False
Answer:
False I believe I just went in quizzlet
Species that only use asexual reproduction only develop new genetic combinations through the process of mutation.
A. True
B. False
Yes, this is true, because in asexual reproduction there is very little genetic diversity, except in the case of a mutation.
Describe Ted Bundy’s childhood and his relationship with his family.
Answer:
Bundy was born at a home for unwed mothers in Burlington , Vermont, on November 24, 1946. He remained there for two months after his birth. His mother, Eleanor Louise Cowell, known as Louise, considered placing her baby up for adoption, but her father, Sam Cowell, apparently wanted the baby to join the family in Philadelphia. HOPE THIS HELPSSSSS!
Explanation: