This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..
Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..
This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..
Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..
Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..
Illusions are the perceptions and sensory data obtained from situations in which human error prevents us from seeing the..