Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..
A still body of water may be disturbed by a variety of factors. One of them is wind. In fact, it is considered as the pr..
Some of the body movements can be controlled at will, others cannot. The body has a motor program, which is the pattern ..
This tutorial noted some of the physical and chemical factors that provide the framework of a running water community in..
Plants are characterized by having alternation of generations in their life cycles. This tutorial is a review of plant m..
There are more species of insects than any other species combined. This surely illustrates that insects have the selecti..
