The shell of an egg has many important functions. First of all, the protection of the internal parts. Also, the shell protects the embryo. This is protection against mechanical damage, natural enemies, and so on. The eggs came from reptile breeding. Thanks to the shell, reptiles lay their eggs not in water, but on land. The same goes for birds. Fish and amphibians lay eggs. Among mammals, only platypuses and echidnas reproduce with the help of eggs. They are the oldest mammals in existence today.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.