Ecology homework help

I have two questions the first one needs to be a minimum of 200 words and the second a minimum of 75 words.  Please clearly read the questions and be very detailed.
Explain the theory of island biogeography. What factors determine the rate of immigration (new species establishment) and extinction? (200 words)
Explain the intermediate disturbance hypothesis as it relates to successional stages and species diversity. (75 words)