Biology

Biology

A natural science concerned with the study of life or living matter in all its forms and phenomena, especially in relation to their origin, growth, reproduction, structure, behaviour and evolution.

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Biology > Anatomy

axial skeleton

Biology; Anatomy

The skull, vertebral column, and rib cage; one of the two components of the skeleton in vertebrates.

anaerobic

Biology; Anatomy

Refers to organisms that are not dependent on oxygen for respiration.

biosphere

Biology; Anatomy

All ecosystems on Earth as well as the Earth's crust, waters, and atmosphere on and in which organisms exist; also, the sum of all living matter on Earth.

auxins

Biology; Anatomy

A group of hormones involved in controlling plant growth and other functions; once thought responsible for phototropism by causing the cells on the shaded side of a plant to ...

anabolic reactions

Biology; Anatomy

Reactions in cells in which new chemical bonds are formed and new molecules are made; generally require energy, involve reduction, and lead to an increase in atomic order.

amoebocytes

Biology; Anatomy

Amoeboid cells in sponges that occur in the matrix between the epidermal and collar cells. They transport nutrients.

autonomic system

Biology; Anatomy

The portion of the peripheral nervous system that stimulates smooth muscle, cardiac muscle, and glands; consists of the parasympathetic and sympathetic systems.