The answer is B It must be testable.
An example i can think of is...
the amount of salt present in human cells cytoplasm suggests we evolved from species in the sea
Answer:
When cells split and increase they do this very important thing in order tonmake the new cells exactly the same as the previous before them. Each cell makes more of all it's genes. Then each one.splits into two with one group of genes in each one of the new cells. During the process they make sure that all are copied correctly.
