It would be nice to put people on the ground and have them do a species-by-species tracking.
人们躺在地上，和大自然来个亲密接触，这将会多美妙啊。
2
Biologists can infer how species are related evolutionarily by comparing DNA sequences for the same genes in different species.
生物学家可以通过比较不同物种中相同基因的 DNA 序列来推断物种之间的进化关系。
3
Prey species, like young deer or goats, for example, typically play by performing sudden flight movements and turns, whereas predator species, such as cats, practice stalking, pouncing, and biting.