Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
extinction – n. the state or situation that results when something (such as a plant or animal species) has died out completely
species – n. a group of animals or plants that are similar and can produce young animals or plants
implication(s) – n. a possible future effect or result
poster child – n. a person who represents or is identified with something
proportionality – n. the condition of having a size, number, or amount that is directly related to or appropriate for something
invasive – adj. tending to spread
ecosystem – n. everything that exists in a given environment
