Unlike humans that draw air in with the aid of a muscular __, frog lungs need air to be pumped into them like balloons. This is called __ breathing.

Multicellular organisms use cell division, mitosis, for growth and the maintenance and repair of cells and tissues. single-celled organisms may use cell division as their method of reproduction. regardless of the reason for mitosis, the process ensures genetic continuity. what is the step in the cell cycle that ensure genetic continuity?