Because the amount of rainfall isn't the same every year
By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. There are gaps in the fossil record because many early forms of life were soft-bodied, which means that they have left few traces behind. This is why scientists cannot be certain about how life began.
Its An experiment because it doesnt ask a testable question
So its B
i hoped it helped SIS
C. Are vascular is the answer
In frogs, different mating seasons are a barrier to reproduction.
