Until when is the embryonic period in sheeps

Study of individual's entire lifespan

Most critical period during gestation

Until when is the embryonic period in cattle

Study of prenatal development of an organism

Time of development during which organs grow and begin to function

Theory that says that structure of an animal emerges gradually from a relatively formless egg

Theory that Aristotle proposed

Father of Embryology

Lining of the digestive tract is derived from where

Theory that says that origin and evolution of a species is a continuing process

Father of Experimental Embryology

Cells that give rise to all tissues and organs of the body

This is the precursor of all connective and muscle tissue