A Brief Over-view of the Etymology of Modern Goju-ryu Karate-do Kata. By Joe Swift and Mario McKenna. It is now well documented that Okinawa karate is indebted to the Southern schools of Chinese boxing for much of its technical knowledge and expertise.
Best Answer: They are all warm-blooded, and they all have hair even if you can't see it (including dolphins and whales). Mammals all share mammary glands (milk producing glands). This is the biggest feature, also mammals use 3 bones for hearing and they have hair. Should be noted that endothermy (warm-blooded) is not unique to mammals, birds also share this characteristic.
Instead, scientists look to features of skeletons that are preserved in fossils such as three bones in the ear and a unique jaw joint.Ancestors of mammals first To know when mammals appeared, we need to know what characteristics make an animal a mammal. There are a few we think of right away â mammary glands to produce milk, warm-blooded, hair or fur, and birth of live young. Most of these features, however, are lost in fossils because they are made of soft tissue that decomposes.