Why is crumpling a piece of paper a physical change and not a chemical change?

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?

Which organelle breaks down sugar molecules that supply energy to the cell ?

Which statement best compares aerobic and anaerobic respiration