Evolution - The change in heritable traits in a population of organisms over successive generations.⏎
Egg Cell - The female gamete, or sex cell, which carries the hereditary material of the female parent and unites with the male sperm cell during sexual reproduction.⏎
Ecology - A branch of science that deals with the relation of organisms to one another and their physical environment.⏎
Exoskeleton - An external skeleton that protects and supports an organism, in contrast to an internal endoskeleton.⏎