Genes. Chromosomes carry genes that contain genetic information of the organism it is in.
Hope this helps :)
A might be it not to sure sorry
I believe it is natural selection. Natural selection is when over a period of time, traits that are formed to help the organism survive, are passed to the next generation. For example, if there were two types of rabbits. One had black fur and the other was white. They both lived in the artic. The black furred rabbits are mostly eaten by predators because their black fur is easily seen against the ice and snow. Over a period of time, the black furred rabbit would die out. The next generation would mostly have white fur to help them survive.
Moisture will drop as rain as the air moves up the side of the mountain.
Hope this helps!
