Enzymes are important biological catalysts because they:a
supply the energy to initiate a biochemical reaction.
b. increase the free energy of a biochemical reaction.
c. lower the entropy of a biochemical reaction.
d. decrease the enthalpy of a biochemical reaction.
e. lower the activation energy of a biochemical reaction
E
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During the nineteenth century, sea otters were hunted almost to the point of extinction. When the number of sea otters became very low, it was noticed that the ecosystem of kelp bed "forests" was also disappearing
It was discovered that the sea otters were predators of sea urchins, which were, in turn, predators of the kelp. When sea otters declined, the sea urchin populations grew, destroying the kelp ecosystem and the many species that depended on it. What role did sea otters perform in this ecosystem? A) competitors B) producers C) a keystone species D) parasites