For each of the following questions or statements, choose the number of the response which best answers the question or completes each statement. For survival, a hummingbird uses a considerable amount of energy.
Cells come from preexisting cells.
Viruses are true cells. Cells are basically unlike in structure. Mitochondria are found only in plant cells. A new drug for the treatment of asthma is tested on 100 people. The people are evenly divided into two groups.