How does evolution explain the diversity of on Earth?

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.

How many cells are our body made of ? ♡

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