Which mechanism requires energy? a. exocytosis b. osmosis c. diffusion of oxygen into a red blood cell. d. diffusion of ions through a potassium channel

Talking listening and reacting non verbally are all part of communicating

Which of the following is a true statements about viruses? viruses have no nucleus. viruses are alive. viruses have a cell membrane. all viruses are deadly.

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. take for example the cells that line the digestive tract. these cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. what mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell