Mammalae, or breasts.
mammary glands
These features were used to classify organisms before the development of DNA analysis. This way, scientists were able to look at certain morphological traits to classify the organism and then correlate them to their closest relatives. For example. Although bats are a lot like birds, certain morphological traits allow them to be classified as something other than birds. i.e. they are mammals - they have similar bone structure to most mammals In this regard, it is based traits other than their wings that they are classified as mammals, and not birds. Hope this helps
Aristotle made a classification of living things. There were probably others earlier than him, but his is fairly sophisticated. He classified whales as mammals, for example.
YES
mammals
BackboneHairYoung aliveNurse the young
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.
mammals
mammals
Deer are mammals.
organisms * fish * mammals * grasses
yes