Velocity is in relation to direction it is the speed plus direction it's going, and speed is distance over time
it should be the second one
Extinction events often clear niches out to make way for other species.
The species that survive an extinction event will pass on the genes that allowed them to survive onto their offspring, which causes the species to gradually evolve.
Food is moved through the digestive system by a process called peristalsis<span>.
Hope this helps !
Photon</span>
I have a feeling it's when they are embryos.
