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Natural selection
Natural selection is the phrase Charles Darwin used in 1859 for the process he proposed to explain the origin of species and their apparent adaptation to their environment. Along with the rules of ... > more -
American Quarter Horse
The American Quarter Horse is a breed of horse originally bred for sprinting short distances, typically races of a quarter mile or less. The Quarter Horse is the most popular breed in the United ... > more -
Protein structure
Proteins, similar to carbohydrates and lipids, are made up of such elements as carbon, hydrogen and oxygen. They are amino acid chains, made up from 20 different L-alpha-amino acids, also referred to ... > more -
Bone marrow
Bone marrow is the tissue comprising the center of large bones. It is the place where new blood cells are produced. Bone marrow contains two types of stem cells: hemopoietic (which can produce blood ... > more -
Cell (biology)
The cell is the structural and functional unit of all living organisms, and is sometimes called the "building block of life." Some organisms, such as bacteria, are unicellular, consisting of a single ... > more -
Dead zone (ecology)
Dead zones are hypoxic (low-oxygen) areas in the world's oceans, the observed incidences of which have been increasing since oceanographers began noting them in the 1970s. The term could as well ... > more -
Evolution of the eye
The evolution of the eye has been a subject of significant study, as a distinctive example of a homologous organ present in a wide variety of species. The development of the eye is considered by most ... > more -
Hair follicle
A hair follicle is part of the skin that grows hair by packing old cells together. Attached to the follicle is a sebaceous gland, a tiny sebum-producing gland found everywhere except on the palms, ... > more
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