30 POINTSS Your science lab group must plan and carry out an investigation on how limiting factors affect the biodiversity and populations in a forest ecosystem. The focus of your investigation must be on a density-dependent limiting factor. Which of the following questions could your lab group use to focus their investigation? Select all that apply.

A
What is the effect of overcrowding on the number of deciduous trees?

B
What is the effect of seasonal changes on the population of squirrels?

C
What is the effect of competition on the population of deer?

D
What is the effect of disease on the bird population?

E
What is the effect of sunlight on the forest floor plants?