Choose "extinct" if the species is extinct and "endangered" if the species is endangered. two hundred years ago, billions of passenger pigeons lived in north america. the last known passenger pigeon died in the cincinnati zoo in 1914.

Water is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place? from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma

How many moles are in 123.0 grams of kclo4?

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules