An action or a change in behavior that occurs as a result of a stimulus.

The maintenance of stable internal conditions regardless of external conditions

An organism that obtains energy by feeding on other organisms

An organism that can make its own food

The process by which molecules move from an area of higher concentration to an area of lower concentration.

The diffusion of water molecules through a selectively permeable membrane

The movement of materials through a cell membrane using cellular energy

The stage of a cell cycle during which the cell's nucleus divides into 2 new nuclei and one copy of the DNA is distributed into each daughter cell.

A change in body form characterized by four dramatically different stages

A change in the body form of the egg, nymph, and adult stages

Plant cell structure in which photosynthesis takes place

The process that occurs in formation of sex cells, by which the number of chromosomes is reduced by half

The genetic material that carries information about an organism and is passed from parents to offspring

A nucleic acid that plays an important role in the production of proteins

The process by written which the genetic in DNA is transcribed onto a strand of mRNA

The process by which a protein chain is created from information contained within RNA

The passing of traits from parents to offspring

An organism's physical appearance, or visible traits

An organism's genetic makeup, or allele combinations

The scientific study of how living things are classified

Having cells that do not have a nucleus/nuclei

Having cells that contain a nucleus/nuclei

A close relationship between two organisms in which at least one of the organisms benefits

A close relationship between two organisms in which at least one of the organisms has benefits

The phylum whose members have a notochord, a nerve cord, and slits in the throat area at some point in their lives

An animal whose body regulates its own temperature by controlling the internal heat it produces

An animal whose body does not produce much internal heat