Unless you exempt humans, who are mammals, yes.
All mammals are animals. So are birds, snakes, fish, snails, worms and clams. Mammals are animals that are warm-blooded, breathe using lungs, have hair and fur, and mostly give birth to live young (monotremes are mammals that lay eggs).
Both. Humans are animals in the order Mammalia. All mammals are animals, but not all animals are mammals.
No, all sea animals are not mammals. Fishes are not mammals, but dolphins are mammals.
possums are BOTH! mammals ARE animals! all mammals, reptiles, and amphibians and so on are ALL animals.
yes because mammals are animals and humans are mammals so there for everything is a animal.
Not all animals, but most mammals do, hence why people have periods (people=mammals)
All mammals
Guinea pigs are mammals. All animals with fur and give milk are mammals.
I assume "non mammals" in your question means all animals that are not mammals. There are over one million species of animals in the world that are not mammals. We cannot give an exact number because we do not know how many undiscovered animals there are. Mammals make up less than one half of one percent of all animals. If you are asking, "How many individual animals are there on earth that are not mammals?" then no one can answer.
All mammals have fur, some other animals can have fur e.g the platypus which lays eggs but has fur so it has characteristics of both mammals and reptiles but all mammals have fur.
Yes. Whales are mammals and all mammals defecate, as do most animals.
Mammals inhale oxygen and exhale carbon dioxide, as do all animals.
It is rephrased as mammals are homeothermic animals .