I think it's b because it seems obvious
Answer:
New predators move into the ecosystem
Explanation:
A limiting factor is anything that constrains a population size and slows or stops it from growing,so when predators move into the ecosystem they compete with other organisms for resources
The answer would be D plants.
They are producers because they create their own food
The brain stem connects the spinal cord to the cerebrum.
B alleles that are expressed