What percentage of plants in the remaining rainforest have been identified?

And while 25% of Western pharmaceuticals are derived from Rainforest ingredients, less than 1% of these tropical trees and plants have been tested by scientists. The U.S. National Cancer Institute has identified 3000 plants that are active against cancer cells. 70% of these plants are found in the Rainforest.

Explanation:

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.