Which element provides strength to the exoskeletons of clams and oysters?
a) sulfur
b) oxygen
c) hydrogen
d) phosphorus

How can you keep track of variables in a science experiment?

Rotenone is an insecticide that is toxic

If a baby girl guinea pig looks almost identical to its mother, does this then mean that it inherited more alleles from its mother? explain. (hint: think about the vocabulary words dominant and recessive.)