Which of the following is an example of how a biotic factor can affect the population dynamics in an ecosystem? (4 points)

a
Lack of water during a drought causes many of the individuals in a population to die.

b
Seasonal temperature changes cause a species to migrate between two ecosystems.

c
Excessive rain and flooding cause organisms in an area to relocate.

d
The population of a predator increases following an increase in the population of its prey.