The atmosphere may be defined as a transparent gaseous envelope surrounding the Earth. The vertical profile of the atmosphere shows several concentric layers. ...
Hamid Ali
Helotism refers to a social relationship in which one organism, known as the helot, depends on another organism, known as the host, for various resources or ...
Ecological succession refers to the process of gradual and predictable change in the composition and structure of an ecological community over time. It occurs ...
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