bird bones are smaller and light weight, and this is why they can fly easier. if a mammal tried to fly, with its thick bones, it might wind up with shattered ones
there are nervous
caca
Dinosaurs were endotherms
A placental Mammal is a mammal that keeps the young inside the body until it can function independently.
Bacteria cells differ from mammal cells because they have no nucleus and have genetic material which is stringy and thick found in cytoplasm
This might be a trick question, since mammals do NOT hatch their young in eggs - that woulde be birds and reptiles.
It depends upon type of mammal and age of fossil .
The same as the penis of any other mammal; to pass urine and sperm.
A mammal that keeps the baby inside the body until it can function independently, and is a predator.
it extracts food and oxygen from the uterine wall of the mother to the fetus.
Every mammal has nipples. It is through the nipples that newborn mammals access the milk their mothers produce for them (the perfect food for a newborn mammal).
Mammals have a closed Circulatory system. Parts of the system include a heart and veins. It is complex.