As a cell grows, its volume increases more than its surface area so the answer is C
Answer:
The best way to determine if these populations form part of the same species is to study the existence of reproductive isolation between populations. Moreover, the result of an experiment based on the study of reproductive barriers may be complemented with molecular biology approaches that determine the level of sequence homology between populations
You've answered it yourself: its called the crust.
A they are cheaper hope that helps the rest of the answers are disadvantages