Black for the first,
Brown for the second,
And,
White for the third.
Hope that his helps you..
The answer would be D. Huntington's disease presents symptoms in humans after many have already reproduced; therefore, they are unaware that they passed on Huntington's disease.
Cytosine pairs with Guanine
Adenine and Thymine are pairs also
Hope this helps :)
It might change over time to compensate fir its environment