For the pheasant question, it would be the top right graph as this shows an increase, then a further increase in the population of pheasants.
For the population of the world graph, it shows positive exponential growth as it is a large amount of growth within a small time period
Thicker Skin, Fur, More Fat Content
Since people with HIV have weakened immune systems it would be:
C) People with HIV are unable to fight off these rare diseases.
C is the answer. I think this is where babies occur.