Drilling for fossil fuels.
This is because the main fossil fuels are not typically found in the rainforest. To also back up this claim, use the process of elimination.
The last choice, demand for rainforest products, is obviously incorrect as that would mean expansion into the rainforest to gather said products.
Shortage of food sources wouldn't be the correct answer either as food sources aren't typically found in the rainforest among popular demand and food can be shipped into the country as well.
Overcrowding in cities would also lead to expansion, where to can differ based on location but to rainforests or anywhere surrounding the area would be preferred or desirable.
Hope this helps!
possessing characters of both sexes and especially both male and female reproductive structures
hope this helps.
Answer: In adaptive radiation, many different species evolve from a single ancestor species. Each new species evolves to exploit a different niche, such as food source. In the example above, Hawaiian honeycreepers evolved a range of bill forms in response to available food sources on the Hawaiian archipelago. The honeycreepers dispersed from one founder species, and evolved in response to natural selection based on different food sources in their isolated habitats provided by water. Seed-eating birds evolved thick, short beaks.
