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.
Mammals Have Hair Or Fur, Non-Mammals Don't.
Sharks are NOT mammals.
It depends on what you mean by non-mammals. If you are counting all matter as a non-mammal, then most non-mammals are not organisms. If you are counting a non-mammal as any life form or any animal that is not a mammal, then all non-mammals are organisms.
There are 4260
5
37
if your talking about what is the difference between mammals and non-mammals, the difference is: the non-mammals lay eggs and the mammals just have baby's out their vagina.. XD
around 400 billion
532
vertebrae and invertebrate
mammals can give birth to live young they have hair on their bodies and they can produce milk.
The echidna and the platypus are non-placental mammals. They are monotremes, or egg-laying mammals. Kangaroos, wallabies, koalas, bandicoots, wombats and Tasmanian devils are just a few other non-placentals, as they are marsupials.