When did doctors start using heart transplants on the public? how many lives have been saved by heart transplants?

Photosynthesis converts light energy to chemical energy. which molecules are the end product of this transformation of energy in this reaction?

List the advantages and disadavantages of the switch from persistent chlorinated hydrocarbon pesticides (such as ddt) to nonpersistent organophosphate pesicides. have the benefits of the switch outweighed the disadvantages? explain.

Suppose you could go back in time to interview henri becquerel on the day he discovered radioactivity. from his perspective, write an account of the discovery.