Organisms maintaining a constant internal balance, keeping things stable.

The smallest living structure that is common among all living organisms – contains DNA, a cell membrane, and other structures.

The repeating process of cell growth and reproduction through mitosis.

Tissue in animals that transports oxygen, nutrients, and wastes around the body.

A molecule similar to DNA that can be used in ribosomes (rRNA), for carrying amino acids (tRNA), or for carrying a DNA message (mRNA)

Classification of organisms based on similarities in structure, genetics, origin, etc.

The basic sugar that is broken down in cells for energy. Made in photosynthesis, broken down in respiration.

An experiment that showed that simple organic molecules could form in the primordial conditions on Earth.

An organ system that produces hormones, sending signals around the body.

A set of tissues in plants that transports water (mostly tubes in the stem and roots).

A group of organisms of the same species in a particular area.

A living thing – may be as simple as a single-celled bacteria or as complex as animals

A limit to how many organisms can be supported by their environment.

An interaction among organisms in which one benefits while the other is unaffected.