Genetics - A branch of biology that studies heredity and variation in organisms.⏎
Epidemic - An often sudden increase in the level of disease in a specific population over a given period of time.⏎
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.⏎
Fertilized Egg - Sometimes referred to as a zygote, this is the resulting initial cell formed when a sperm cell unites with an egg cell.⏎