Yes, So they can more easily sink into water.
Yes, people from African decent have more dense bones than people from European decent.
Mammal bones are less dense and thicker, because they don't have to deal with the stresses of flying. The bones of a bird are thinner, and have a dense structure of internal struts that make the bone exceptionally stiff and strong.
When a person becomes older, there bones will become more dense. When bones are more dense, they can break easily.
in the jaw
LIGAMENTS
Osteoporosis
Muscles are heavier and more dense
Ligaments and tendons are made up of dense connective tissue because they need to be strong and able to withstand the tension and forces exerted on them. The dense connective tissue provides structural support and helps in connecting muscles to bones (tendons) and bones to bones (ligaments).
Osteoporosis is a bone disease in which the bones become less dense and more brittle. Osteosclerosis is the medical term meaning abnormal hardening of bone.
Dense fibrous connective tissues that connect muscle to bone are known as tendons.
it helps them fly because their bones are lighter and its easier to fly with light bones. But birds with dense bones, such as penguins makes it impossible for them to fly
Muscles are attached to tendons ( a dense connective tissue) which are then attached to Bones. Muscles -> Tendons -> Bones