What did charles darwin mean when he stated that some organisms were 'more fit' than other organisms?

Which of the following is a true statement? question 8 options: populations can't evolve, only individual organisms. individuals have adaptations that can change over time. individuals have traits that may or may not make them successful at reproduction. individuals evolve to have adaptations.

Omg substrates with the same size and shape as the active site will bind to the enzyme. why is the key labeled the “bad” substrate?

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