The body cover of the grass frog.

The frog’s skin has a large number of glands, which tend to secrete mucus. It is this mucus that helps to retain water and helps with gas exchange.

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.