Take a deep breath. where does that air you breath in go? it goes into your lungs, but that's not the end! your circulatory system to move the oxygen to all of your cells. what carries the oxygen to every cell in your body?
a) blood
b) food
c) heart
d) veins

Coral have a symbiotic relationship with what in order to eat?

Which type of neuron stimulates muscles to contract?

You are studying a protein that you call protein x. there is an aspartic acid at a key position in protein x which is important in the folding and stabilization of that protein. if this aspartic acid is changed to a different amino acid, which type of amino acid substitutions is most likely to allow the protein to fold normally?