How is earth's early land environment different than today's land environment?

Answers

Answer 1
Answer:

Answer: The early earth environment was having hydrogen in abundant amount. the early atmosphere was full of methane, ammonia, hydrogen sulfide and water. Today the atmosphere contains 0.03% of carbon dioxide in the environment which was higher in the early days of life. There was no life because of less amount oxygen in the environment.

Now the environment is full of oxygen and has less amount of carbon.






Answer 2
Answer: in the early years of our planet, earth was hot, it was a cluster of asteroids, and was constantly being bombarded with them. earth started to cool down and millions of comets are thought to have filled the oceans.

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Under which condition is competition among wolves most likely? A.When new vegetation grows in the habitat, bringing new prey to the area B.When a disease kills a large amount of the rabbit population C.When there is an increase in sunlight in the habitat D.When there is abundant rainfall in the area

Answers

When a disease kills a large amount of the rabbit population which is the competition among wolves most likely. So, the correct answer is (B).

What is Competition among animals?

Competition is the interaction of individuals that fight for a common resource which is in limited supply, but more likely can be defined as the direct or indirect interaction of organisms which leads to a change in fitness when the organisms share the same resource. This results in the negative effects on the weaker competitors.

There are three forms of competition  among the animals. Out of three. two of them , interference competition and exploitation competition, are categorized as real competition and the third form is apparent competition which is not a real competition.

Interference competition occurs directly between different individuals but exploitation competition and apparent competition occur indirectly between  different individuals.

Thus, when a disease kills a large amount of the rabbit population which is the competition among wolves most likely. So, the correct answer is (B).

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B When a disease kills a large amount of the rabbit population

You perform a spread plate to determine the bacterial population in a batch liquid media. You plate 0.1ml of a 10-5 dilution. You incubate the plate and count 10 colonies (cfu). What is the bacterial population in cfu/ml of the stock (undiluted) culture? 10 million colonies 1 million colonies 100 million colonies

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Answer: 10 million colonies

The volume of media used is 0.1ml and the concentration diluted to 10^-5, so the actual volume used would be: 0.1ml * 10^-5= 1ml * 10^-6

The media shows 10 colonies. The number of colonies per volume would be: 10 cfu/ (1ml * 10^-6)= 10* 10^6 cfu/ml= 10 million cfu/ml

On which feature is science based?detailed research with reliable sources
static information that does not change
emotional appeals
test that cannot be repeated

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Science is based on the feature of "detailed research with reliable sources" among many other things. It is crucial that the tests can be repeated with the same results. 

Correct answer: A). Detailed research with reliable sources

Science is a collection of systematic knowledge that is acquired through study and organizing gained knowledge in the form of testable interpretation and prognostication about the universe.

The science tries to relate the knowledge to the facts that follow objective laws and whose development need systematization and method.

Hence, the correct answer would be option A.



What part of the body has lots and lots of human cells, where we can easily access these cells and extract DNA?

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Answer:

i think it is bone marrow or the brain because every cell has dna

Which of the following is the most common type of hydrolysis damage in the cell?A. deamination of thymidineB. breakage of the glycosidic linkage between the pyrimidines and the DNA backboneC. removal of cytosine from the DNA backbone to create an abasic siteD. deamination of cytosine to uracilE. None of the damage types given is known to occur in cells.

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Answer:

D. deamination of cytosine to uracil

Explanation:

Hydrolytic DNA damage is usually a consequence of metabolic reactions and the most common example of this type of damage is hydrolysis of cytosine into uracil with the release of ammonia. This damage can be fixed by the cell's DNA repair system:removal of uracil  by an enzyme uracil-DNA glycosylase and consequently generation of an abasic (AP) site.  AP endonucleases recognise AP site and break a phosphodiester bond so that lesion can be replaced with another cytosine.

In an axiomatic system, which category do points, lines, and planes belong to?a.theorems

b.axioms

c.undefined terms

d.definitions

Answers

The correct answer is C. In an axiomatic system, which category do points, lines, and planes belong to undefined terms. A point has no size or dimension. It has no specified length, width and thickness.

C.) Undefined Terms  

A point has no size or dimension.