Answer:
B. 20%
Explanation:
The complementary base-pairing rule states that Adenine always pairs with Thymine (A with T), and Cytosine with Guanine (C with G).
Because of this, the amount of Adenine present must be the same as the amount of Thymine present, and the same for Cytosine and Guanine.
This means that if there is 30% Adenine, there is also 30% Thymine as each A base is paired to a T base. This adds to 60%, so Cytosine amounts and Guanine amounts must add to 40% to make 100%.
Since they are equal in amount, there must be 20% of each.
Therefore the answer is B. 20%
There is 30% Adenine, 30% Thymine, 20% Guanine and 20% Cytosine.
Hope this helped!
One of the major negative factors from urbanization is A. impervious surface, creating more runoff and less fresh water infiltration.
Runoff refers to the draining of water, which happens more and more as societies progress and advance, and as new towns and cities are created as a result of urbanization. Also, there will be less and less fresh water, which is why urbanization needs to be controlled.
Answer:B. The variety of species in an ecosystem
Explanation:
<span>I think the last answer presents the truth reveled by the molecular clock. The statement is true, it claimed that clams and snails have stronger relationship than squids. The findings can be strengthened with the origin of their class. All of the said animals came from Phylum Mollusca which make these animals related, but stronger structural relationship can be identified with snails and squids because they are both in the Class Gastropoda. The squid came from Class Cephaloda which makes it more related with octopus and cuttlefishes.</span>
