Why do monkeys need the trees?

Answer 1

Primates require UV sunlight to ensure they will maintain proper skeletal development. Primates without an adequate level of sunlight may develop conditions like metabolic bone disease. Exposure to natural light also helps in the production of vitamin D3.

Answer 2

No. They are not autotrophs (producers). They are herbivorous heterotrophs (consumers).

Answer 3

because they are hungry