Biological macromolecuels fall into four main classes.

a. True
b. False

How did alexander fleming’s research solve a societal problem? he developed ways to treat inherited diseases. he advocated for regular hand washing to kill germs. he discovered a new type of medicine that could treat infections. he discovered the cause of mad cow disease, an emerging disease.

The part of the eye that closes and opens to let light in is .

Does all the energy stored by the phytoplankton reach the top level of the pyramid