B. They become extinct
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The answer is descent with modification.
Descent with modification practically means that a species have changed appearance wise over long periods of time to adapt to their environments better.
I think it would be advantageous to observe mold colonies on an agar plate because one is able to observe colony structures, pigmentation, among others. Colony forming units are the individual colonies of bacteria,yeasts or mold. A colony of bacteria or yeast refers to a mass of individual cells of same organism, growing together.
Answer:
It is the second option. Lost as heat.
A. - A Few Days After Fertilization.