Which of the following is true of viruses? They reproduce quickly and easily.
They attach themselves to living cells.
They only attack major systems of the body.
They contain many different types of cellular material.

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form

Jason adds the antibiotic penicillin to a bacterial culture. the bacteria develop genetic modifications in their genome, which gives them resistance to the antibiotic penicillin. what caused this genetic modification?

Which is one example of a phenotypic change that is not genetic