Final answer:
Your lab group should investigate how predation affects the biodiversity and populations in a forest ecosystem as a density-dependent limiting factor.
Step-by-step explanation:
In an investigation on how limiting factors affect biodiversity and populations in a forest ecosystem, your lab group should focus on a density-dependent limiting factor.
A possible question for your investigation could be:
How does predation affect the biodiversity and populations of organisms in a forest ecosystem?
Predation is a density-dependent limiting factor because its impact on the population depends on the density of the predator and prey populations.
By studying the relationship between predator and prey populations in different areas of the forest, your lab group can assess how predation affects biodiversity and population dynamics in the ecosystem.