Contagion - A general term for any disease-causing infectious agent spread by direct or indirect contact.⏎
Encephalitis - Inflammation of the brain, often caused by a virus.⏎
Evolution - The change in heritable traits in a population of organisms over successive generations.⏎
Genetics - A branch of biology that studies heredity and variation in organisms.⏎
Fertilized Egg - Sometimes referred to as a zygote, this is the resulting initial cell formed when a sperm cell unites with an egg cell.⏎