Scientists Test Ways to Save Rhinos

extinction –n. when a living thing completely disappears from the earth

implant –v. to place something in the body surgically

in-vitro –adj. outside the body

surrogate –n. someone or something that takes the place or performs the duties of someone or something else

flooding the market –idiom. to put a lot of some product on the market at the same time

artificial –adj. man-made; not natural