Humidity is defined as the amount of water in the Earth's atmosphere. It is measured by the wet and dry bulb hygrometer.
When humidity is low, land organisms and trees tend to loose more water than when it's high. Plants loose water from parts such as leaves and bark and land organisms loose water from their their skin.
Rainforest is home to around 40% to 75% biotic species. There's tremendous biodiversity in the plant life of the tropical rainforest. This is why it supports a very broad array of reptiles, birds, mammals, and invertebrates. So, to answer the question above: C.
