Answer:
unicellular life first
Explanation:
it arose billions of years ago while multicellular life forms around at least 600 million years ago
Terrestrial ecosystems (tetrapods)
A) Crossing over is the mechanism of genetic variation that results from the exchange of gene segments between non-sister chomatids.
A microscope to examine the butterfly. and a small pair of tweezers to pick up and put down the butterfly
It’s true. Stems are organs that hold the trees and plants up and also produces the leaves and secondary stems
