The spherical bacteria of the species $Neisseria$ $gonorrhoeae$ are responsible for which sexually transmitted disease in humans?

Reproduction is essential for living organisms in order to

What is the effect of $DNA$ copying,which is not perfectly accurate,on the reproduction process? How does the amount of $DNA$ remain constant though each new generation is a combination of $DNA$ copies of two individuals?

''Variations'' are seen in the organisms. State the two main causes of variation.

Which unicellular organism reproduces by budding?

In which plant does vegetative reproduction occur through the stem?