a chemical element or substance required in trace amounts for the normal growth and development of living organisms.
4 significant figures I think
Birds and most land and water animals get along. the birds clean the bugs and old mean off of most animals and that gives them food for babies. but birds are pray to.
The ocean basins are grooved and ridged
In The metabolism of amino acids for energy, what is the fate of the amino group?
Excreted as urea
