(evolutionary theory) A subfield of biology concerned with the origin and descent of species and as their evolution, multiplication and diversity over time.

(biology) The branch of biology dealing with organisms that live in the sea.

(biology) The systematic study of the complex interactions in biological systems / (by extension) The study of the self-organizing behaviour of complex, dynamic non-biological systems

(biology) The scientific study of the state of Earth's biodiversity with the objective to protect it from becoming extinct.

(biology, ecology) The study of populations of organisms, especially the growth and regulation of population sizes and genetics, and the effects of interactions between species.

plural of developmental biology

(biology) A branch of biology that studies the interaction of evolutionary and developmental processes.