It is widely accepted that the earth, as one of the bodies of our solar system, came from a rotating cloud. what was this cloud most likely made of?

solar nebula

Explanation:

The nebular hypothesis is the idea that a spinning cloud of dust is made of mostly light elements

"a.) well–developed vascular system."

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.