Why do animal cells mitochondria but no chloroplasts?

Providing immunity by injecting the body with a weakened form a pathogen is known as

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?

What is the starting point in replication called