Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
species -- n. biology : a group of animals or plants that are similar and can produce young animals or plants : a group of related animals or plants that is smaller than a genus
amphibian – n. an animal (such as a frog or toad) that can live both on land and in water
ecosystem -- n. everything that exists in a particular environment
global -- adj. involving the entire world
extinct – adj. no longer existing
relative -- n. something that belongs to the same group as something else because of shared characteristics, qualities, etc.
