A chicken egg is built to grow a chick from zero. Inside one shell you find water, protein, fat, vitamins, and minerals. Almost everything a baby bird needs is there. Vitamin C is the famous exception: chicks must get that from their feed after hatching. For humans, that same package makes eggs one of the most useful foods on the planet.
⚡ DID YOU KNOW?
The shell has thousands of tiny pores so air can pass through while the chick grows inside.