An '''egg''' is a reproductive capsule produced by many animals to reproduce. Fertilized eggs contain [[embryo]]s which develop into whichever [[animal]] laid it. Some animals have eggs which are only visible at a [[cell]]ular level, like humans for example. Usually the egg contains all the [[nutrient]]s the developing animal needs, but mammals some develop within their mothers (such as mammals), almost eliminating the need for eggs. | An '''egg''' is a reproductive capsule produced by many animals to reproduce. Fertilized eggs contain [[embryo]]s which develop into whichever [[animal]] laid it. Some animals have eggs which are only visible at a [[cell]]ular level, like humans for example. Usually the egg contains all the [[nutrient]]s the developing animal needs, but mammals some develop within their mothers (such as mammals), almost eliminating the need for eggs. |