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Timeline of evolution
This timeline of the evolution of life outlines the major events in the development of life on the planet Earth. Dates given are estimates based on scientific evidence. In biology, evolution is the ... > more -
Companion dog
Companion dog usually describes a dog that does not work, providing only companionship as a pet, rather than usefulness by doing specific tasks. Many of the toy dog breeds are used only for the ... > more -
Yellow fever
Yellow fever (also called yellow jack, black vomit, or sometimes American Plague) is an acute viral disease. It is still an important cause of hemorrhagic illness in several African and South ... > more -
Common Chimpanzee
The Common Chimpanzee, also known as the Robust Chimpanzee, is a great ape. Colloquially, it is often called the chimpanzee (or simply "chimp"), though technically this term refers to both species in ... > more -
Chagas disease
Chagas disease is a human tropical parasitic disease which occurs in the Americas, particularly in South America. Its pathogenic agent is a flagellate protozoan named Trypanosoma cruzi, which is ... > more -
Color vision
Color vision is the capacity of an organism or machine to distinguish objects based on the wavelength (or frequency) of the light they reflect or emit. A 'red' apple does not emit red light. Rather, ... > more
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