Just making sure; could there be convection currents without solar radiation? I don't think so but I just wanna be sure haha.

Pepsin is an enzyme in the stomach that breaks polypeptides into amino acids. pepsin functions best at a ph of around 1.5. what would be the most likely result if the ph of the stomach were increased to 5

The leopard frog and the pickerel frog are two closely related species. in areas where their ranges overlap, the frogs will remain separate species if they

Some substances but not other can cross the (blank) membrane of a cell