[pls help 15 points!] Which facts about the worlds rainforests are true? Choose all answers that are correct.

[] half of the known plant varieties in the world are found in rainforests

[] Every continent except Antarctica has a rainforest

[] Less than 1 percent of the plants in the rainforests have been tested for medicinal purposes

[] The proportion of Earth’s landmass covered in rain forests has decreased by 50 percent sine the 1950