How can we use rocks to determine how an area used to look in the past?

1 answer:

8 0

Through looking at layers of rock you can tell what kind of things transpired. If you find Fish fossils you can assume that at one point in time, there may have been a body of water of some sort. if you find certain plants, you can deduce that there was a forest or a grassy pasture. Or if there are variations in the layer you may be able to tell what kind of soil was there at one point in time, or maybe if there is volcanic rock, you could rightly assume there was a volcanic eruption at some point.

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A gene sequence reads ATCGAT. which represents a substitution mutation.

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Answer:

Explanation:

A substitution is where a base is substituted by another base

A. ATGAT - this is not a substitution, the C has been deleted

B. UAGCUA - this is not a substitution, but is the complementary mRNA sequence (you can tell because there are Us instead of Ts)

C. TAGCTA - this is not a substitution, but is the complementary DNA sequence

D. ATGGAT - this is a substitution, the C in the original sequence has been replaced (substituted) by a G.

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