Answer: C. One summer, the size of the turtle population suddenly increases, but then gradually decreases.
Explanation:
Among the given observations, Harvey's knowledge of ecology would be most useful for explaining:
C. One summer, the size of the turtle population suddenly increases, but then gradually decreases.
Understanding the dynamics of population growth and decline, factors influencing reproduction and mortality rates, availability of resources, and interactions with other species in the ecosystem are all central concepts in ecology. Harvey's knowledge of ecology would provide insights into the reasons behind the fluctuations in the turtle population observed over time, such as changes in food availability, predation pressure, habitat alterations, or other environmental factors impacting the turtles' population dynamics.