Answer:
The answer for writing 421,700 km in scientific notation is A
This would be because the grass that they eat are in the area that the zebra population is booming in.
Fossil 3rd one
Homologous: 4th
Vestigial: 1st
DNA: 2nd
Answer:
Because trees create oxygen, and when we inhale and exhale we are turning that oxygen into carbon dioxide and with less tree's we're creating more carbon dioxide then the trees and since trees breath carbon dioxide without them it has nowhere to go