Natural selection gets rid of those who are unfit of surviving and allows those who can survive to reproduce and live on
(homeostasis) (response to stimuli) (reproduction) growth and development
<span>Earth went through a period of hot and also dry conditions and a wide spread drought.These conditions favored reptiles and therefore causing them to evolve during those conditions. Hope this helps :)</span>
Which one? the clssifying matter or the ionic bonds?