Name the stage in organisms before they reproduce sexually

Name the phase, all organisms have to pass through before they can reproduce sexually.

Explain how sexual reproduction gives rise to more vialbe variation than asexual reproduction how does this affect the evolution of those organisms that reproduce sexually?

Will goegraphical isolation be a major fector in the speciation of and organism that reproduces asexually? Why or why not

Name the respirating organs of Butterfly

Which one of the following organisms reproduces sexually only in its time?

How do lower organisms reproduce?