1. Biomes Of The World
... used as pets (e. g. parrots, fresh-water fish); stricter import regulations have alleviated this somewhat. A tremendous variety of tropical rain forest plants have been cultivated by humans. The high levels of secondary compounds in tropical plants have made them valuable as spices, stimulants, and other drugs, and many others are cultivated for food, clothing, and shelter. Recent discoveries ... , Umbelliferae, Labiatae, and Compositae. Environments of the zone are varied enough so that no constellation of characteristics has led particular animal groups to dominate it, but there is a ...
- Word Count: 12375
- Approx Pages: 50
- Has Bibliography
- Grade Level: Undergraduate