Temperature range in tropical rainforest is between 25 to 35 degrees Celsius
This high temperature range is explained by the closeness of the rainforest to the equator. Since it gets the most sunlight in comparison to other rainforests because of its location, it normally gets high temperature.
This allows faster growth on most organisms since they don’t need to use energy to conserve heat. They can spend their energy on feeding and reproduction.
Decomposition happens at a faster rate because most decomposers are active in high temperature.