In the human stomach, chemical reactions take place in an acidic environment. some of these reactions are catalyzed by enzymes. how would these enzymes most likely function in an environment where the ph was doubled?
(a)the enzymes would interfere with chemical reactions by bonding with the reactants.
(b)the enzymes would not be able to function properly outside of their optimal ph range.
(c)the rate of the reactions that are catalyzed by the enzymes would double.
(d)the rate of the reactions would increase as the ph is increased.

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas