The kind of vegetation in a tropical rain forest is generally determined by the amount of

The kind of vegetation in a tropical rain forest is generally determined by the amount of sunlight each layer can accommodate.

Explanation:

Tropical Rainforests are a type of rainforests that happens in regions of tropical rainforest climate where there is no dry season because each month has an average precipitation amounting to 60mm.This forest have divided layers in which vegetation is arranged from a vertical position at each top of the soil to its canopy. The first layer which represents the forest floor can accommodate 2% of sunlight while the second layer, known as the understory layer can accommodate 5% of sunlight.

the answer is b.) hydrogen bonds between bases.