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An ecosystem is a community of living organisms interacting with one another and with non-living organisms. A habitat is the natural envi... -
A mature vascular plant, e.g., a tobacco plant, contains several differentiated cell types. These are grouped together in tissues. Some tiss... -
All living organisms respire. They need to do this so that energy can be transformed into a form that cells can use. In aerobic respiration,... -
What does AIDS mean? AIDS stands for Acquired Immune Deficiency Syndrome: Acquired means you can get infected with it; Immune Deficiency m... -
Background As members of the class Amphibia, frogs may live some of their adult lives on land, but they must return to water to reproduce. E... -
In insects, other arthropods, and most molluscs, blood bathes the organs directly in an open circulatory system. There is no distinction b... -
Each organ of the mammalian digestive system has specialised food–processing functions. The general principles of food processing are simi... -
The Two Stages of Photosynthesis: A Preview The equation for photosynthesis is a deceptively simple summary of a very complex process. Actu... -
Each organ of the mammalian digestive system has specialised food–processing functions. The general principles of food processing are simi... -
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