О млекопитающих:Everyone knows that mammals on earth play a very important role, which will not become less in the future. Man uses not only milk, but meat, and animal skins. Clothing made of genuine leather is practical and has a long shelf life. Mammals, like highly organized creatures, often serve a person, for example, guard, participate in hunting and much more. Will humanity be able to find an alternative to mammals in the future? I do not think so, because they are creatures created by nature and attached to human life for many centuries.