What describes the way an organism looks and its physical characteristics?

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 does this experiment explain why it is often milder in areas such as coastal maryland while areas such as kansas or iowa have more extremes in temperature

Has anyone taken the genetics unit test in connexus? not looking for answers, just a little bit what to expect and some with studying.