The basic unit of structure and function in living things.
A group of similar cells that perform a specific function.
A structure that is composed of different kinds of tissue.
A characteristic that helps an organism survive or reproduce in its environment.
The process by which a new organism develops from the joining of two sex cells.
The joining of an egg cell and a sperm cell.
The process by which a single organism produces a new organism identical to itself
One of about 35 major groups into which biologists classify members of the animal kingdom.
An animal that has a backbone.
An animal that has no backbone.
Line symmetry; the quality of being divisible into halves that are mirror images.
The quality of having many lines of symmetry that all pass through a central point.
The immature form of an animal that looks very different from the adult.
An invertebrate animal that uses stinging cells to capture food and defend itself.
A cnidarian body plan characterized by a vaselike shape and usually adapted for a life attached to an underwater surface.
A cnidarian body plan characterized by a bowl shape and adapted for a free-swimming life.
A group of many individual animals.
A diverse environment named for the coral animals that make up its stony structure.
An organism that lives inside or on another organism and takes food from the organism in or on which it lives.
An organism that provides food to a parasite that lives on or inside it.
An organism that does not live in or on other organisms.
An organism that feeds on dead or decaying material.
The opening at the end of an organism's digestive system through which wastes exit.
Closed circulatory system
A circulatory system in which blood moves only within a connected network of tubes called blood vessels.