If Adenine always pairs with Thymine and Guanine always pairs with Cytosine, what % of DNA would be made up of Cytosine if 20% was made up of Adenine?
A. 20 B.30 C.40 D.60

option b is correct

Explanation:

if adenine is 20% so thymine is also 20% because equal amount thymine and adenine make a base pair the remaining percentage is 60% which is contributed by cytosine and guanine so cytosine contribute 30% and cytosine also contribute 30%

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.