The answer is d. pheromones.
<u>Answer</u>: c. Carrying capacity is the maximum population size required for a particular species in a particular area to survive.
<u>Explanation</u>: this is an average population density level. If the population density is above this level, the number of individuals will decrease. If the population density is under this level, the number of individuals will increase until the carrying capacity is reached once more.
Traits such as skin color and height are variable throughout the human population because these traits are controlled by more than one cell. The cells don't perform at the same rate and don't produce the same biomolecules. Therefore, the maximum height of a person is not achieved which results to variations.
There is an enzyme called polymerase.
