Why is the gallbladder absent in rats?

Compare and contrast nutrient limitation in soil vs. nutrient limitation in aquatic ecosystems

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?

Environmental science are unconsidered with methods to preserve natural resourcesa.trueb.false