An extinct group of amphibians characterized by complex tooth structure and labyrinthine skulls.

A genetic situation where neither allele is dominant and the heterozygote shows an intermediate phenotype.

Relating to tears or the glands and ducts that produce them.

Tears; the fluid secreted by the lacrimal glands to lubricate the eye.

The structure that collects tears from the eye and drains them into the nasolacrimal duct.

The secretion of tears, often as a response to emotion or irritation.

The ionized form of lactic acid, produced during anaerobic metabolism.

An enzyme that converts pyruvate to lactate in anaerobic respiration.

A non-directional movement response of an organism to a stimulus.

The energy possessed by a body due to its motion.