In nature how are the adaptation of organisms determined?

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

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?

The activity of the modern sample is 1.10 bq . how long does that measurement take?