Eggs have an excellent shape because they are naturally designed to keep their contents safe. They have a strong curved shape that helps them withstand heavy forces. They are very compact too. Eggs also have an air sac which is there to give oxygen to the baby chicken as it develops. The air sac is usually at the egg's base, or "fat end". This is why eggs when placed in salt water have tEggs have an excellent shape because they are naturally designed to keep their contents safe. They have a strong curved shape that helps them withstand heavy forces. They are very compact too. Eggs also have an air sac which is there to give oxygen to the baby chicken as it develops. The air sac is usually at the egg's base, or "fat end". This is why eggs when placed in salt water have t (...)