Theodore Schwann added the information that animal tissue is also composed of cells in 1839.Ecology: the study of how organisms interact with their environment.The tendency of two separate elements to grow together.

Gregor Mendel is now known as the father of genetics although is papers on inheritance, published in 1866, went largely unnoticed at the time.Parthenogenesis, parthogeny reproduction without fertilization, as certain ova, seeds and spores, insects, algae, etc.Zygomorphism the state or quality of being bilaterally symmetrical, as certain organisms.

The study of organisms, especially their migrations and distribution.Ultrastructure the submicroscopic, elemental structure of protoplasm.Heredity : All living things have DNA and genetic information codes the structure and function of all cells.