One student group hypothesized that the dry baker's yeast must be alive. the temperature change, odor, and bubble formation, they said, indicated which characteristic of life.

Aseries of connections of food chain in an ecosystem is called a what

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.

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.