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.

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

Which statement can best be concluded from the ideal gas law?

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.