There are a couple features unique to mammals, here are some:
1. Mammary Glands- evolved from modified sweats glands, these are used to create milk for offspring. Only females produce this milk.
2. Hair- this is an adaptation that provides insulation to keep the animal warm, provide protection of the skin, and sometimes camouflage the animal through the hair's color patterns.
3. Sweat glands- while being unique to mammals, they are not present in all of them. For example, whales do not have sweat glands at all because they live in the ocean!
Creation of a social utopia
Answer: the answer is Hominoids
Explanation: Hominoids include all nonmonkey anthropoids—the living and extinct gibbons, orangutans, chimpanzees, gorillas, and humans.
<span> </span>Stars<span> are formed in clouds of gas and dust, known as nebulae. Nuclear reactions at the centre (or core) of </span>stars<span> provides enough energy to make them shine brightly for many years. The exact lifetime of a </span>star<span> depends very much on its size. I hope that answers your question. :)</span>