2 examples of organisms that experience exponential population growth

Which best describes the scientific process

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?