It depends upon type of mammal and age of fossil .
I can say that fossils are bone
Yes, preserved footprints are examples of fossils.
Some examples of non examples of fossils are as follows: knobby rocks, beautiful stones, bones. All fossils are rocks, and if bone fossils are found they will be much heavier than normal bone.
bone?Of course mammals have a back bone or spine. That is one of the features that separates mammals from other animals. We are mammals as well. Place your hand on your back. What do you feel? That's your spine. Dogs, cats, horses, and even fish have spines. There are two groups of animals. The vertebrae and the invertebrate. We are vertebrae because we have spines. Insects are invertebrates because they have what is called an exoskeleton. Their skeleton is on the outside of their bodies instead of the inside.
A valley littered with fossils
it is called "Fossils"
Spongy bone is living.
All mammals can.
Breast bone is round and a leg bone is straight
Mammals are vertebrates and like all vertebrates have only one back bone . Back bone is made up of vertebrae .
Yes. Pigs are mammals, and all mammals are vertebrates (have backbones).
Flying squirrels are mammals and mammals are vertebrae, they have backbones.