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Science
Mar 27, 2008 13:26:24 GMT -8
Post by Tata on Mar 27, 2008 13:26:24 GMT -8
Biodiversity, a term that encompasses the variety of life on Earth. The other aspects of biodiversirty are the variety of ecosystems in trhe biosphere and the genetic variety among individuals whithin a species.
Threats: *Habitat destruction is a major threat. if an animal can not adapt, it has to move, but if there's no were to move to, it dies. *Introduced species new species can take over habitats, forcing the others to move or adapt. *Hunting When animals are hunted, they are killed....
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Science
Apr 8, 2008 13:33:24 GMT -8
Post by Imorta Thaw on Apr 8, 2008 13:33:24 GMT -8
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Science
Apr 9, 2008 13:53:59 GMT -8
Post by Imorta Thaw on Apr 9, 2008 13:53:59 GMT -8
www.dkimages.com/discover/previews/773/267038.JPGwww.ftexploring.com/me-images/epyrmd360.jpg Energy flows from the sun to the plants to the plant eaters to the meat eaters. 1) Primary Producers -- Green plants and certain types of bacteria and Green Plants are primary producers algae are the primary producers because they are the ones that produce usable energy for the rest of the living organisms on earth.They use energy from the sun to make sucrose, glucose, and other compounds that other life forms can eat and "burn" for energy. In each one of those sugar molecules a little bit of the sun's energy is stored in a form that we can call chemical energy. 2) Herbivores - Herbivores are the plant eaters. They have the ability to digest the plants they eat and release the energy stored in the plant cells for their own use. 3) Carnivores - These guys are the meat eaters. Predators and scavengers are in this group. They eat the guys that eat the plants and sometimes they eat each other. Most of these animals can't eat plants at all. They would starve to death if it weren't for the Herbivores digesting the plants first. They've got the glamour job but they're really pretty helpless without all the boring plants and herbivores. 4) Decomposers - They are the guys that eat up dead bodies - both plant and animal. And aren't we glad they do. This group of useful critters are mostly bacteria and fungus. Without them there would be a lot of dead bodies lying around. They're like carnivores and herbivores, because they also have to get their energy from the cells of animals or plants. The difference is they prefer their food dead - very dead.
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Science
Apr 11, 2008 13:28:53 GMT -8
Post by Imorta Thaw on Apr 11, 2008 13:28:53 GMT -8
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