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3 years ago

Natural selection story

1 answer:

3 0

Natural Selection Theory: The Natural Selection Theory is given by Charles Darwin. There are 3 principles of Natural Selection Theory

Variation, Heredity, Selection.

Explanation:

Natural Selection is the cause of evolution. The adaptation to the environment is the key to survival according to Charles Darwin.

The story behind Natural Selection is his visit to Galapagos Islands in 1835. Here he noticed the finches of different varieties in their beaks and food sources adapted to different environments i.e from different islands. This pushed him to think about those adaptations and eventually theory of natural selection.

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Which of the following structures is found in both eukaryotic and prokaryotic cells?

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b. In 1979, the estimated elephant population was 1.3 million and in 2007 it was 640,000. By approximately what percentage did t

saveliy_v [14]

Answer:

The initial amount, 1.3 million = 1,300,000 is the 100%.

now, 640,000 is a given percentage (lower than 100%) of that.

How we can find it?

suppose that 640,000 represents an x%.

Then we have that the quotient between the actual quantities and the percentages must be the same

(640,000/1,300,000) = x%/100%

x% = (640,000/1,300,000)*100% = 49.23%

Then the percentage declined is:

100% - 49.23% = 50.77%

The other question can not be answered with the given information.

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3 years ago

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The right answer is C

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Some bacteria (Pseudomonas) are able, anaerobically, to reduce nitrates to nitrites and then, depending on the case, to dinitrogen (with the enzyme Nitrate reductase A).

NO3- ==> NO2- ==> N2.

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