The answer is A. Differentiation
Recall that a period is horizontal, and a group is vertical.
So if cobalt is moving "down" a period, it would be most logical to say that it would be Ni, or nickel. It could also be Copper, Zinc, Gallium, and so on. Make sense?
It is true that enzymes in the digestive tract catalyze hydrolysis reactions. The reaction happens when a molecule of water is added to the amino acids that are already in the digestive tract.
Members of the same species found in an ecosystem are called a
B: population
