Draw a diagramatic labelled sketch of a sectional view of human ovary.

look it up on Google and draw it yourself, there's no way I can draw it on here

According to E. O. Wilson's theory of island biogeography, the three pressures that lead to biodiversity are the following:
1. immigration - when species immigrate into a new area, they are mixed with the species found there and thus create a diverse biome
2. emigration - the same thing as with immigration
3. extinction events - some species become extinct and give way to another species's birth