Why do birds have bones without bone marrow? Bone marrow is present in all animals which belong to the group mammals. Therefore,bone marrow is absent in Aves. ... The bones of birds are hollow with an air cavity
61. Blood cells are needed for healthy blood, and they are made in the bone marrow, a soft material.62. How many pairs of ribs do people usually have in all?Twelve/12(pairs)63. Where can you find the smallest bone in your body?In the ear.Bones protect and support yout body你的...
1. You cannot see your skeleton because it holds you up from the outside.2. Your skeleton is made of bones.3. All parts of bones are hard.4. Cartilage is harder than bone.5. Cartilage keeps some bones from rubbing against each other.Ⅱ)选择最佳答案。1. Human skeletons have over bones...
Do bones have endothelial cells? What are all the bones in the skeletal system? What produces blood cells in spongy bone? How is bone marrow made? What is created in red bone marrow? Why is the femur used to determine height? Does the skeletal system produce blood cells?
Did ancient sharks have bones? No. Fossil evidence suggests that all ancient sharks lacked a true bone-based skeletal system, relying instead on primitive cartilage structures to provide their bodies with support and flexibility. This means thatsharks have been without bones for millions of years!
Bone marrow is a soft tissue found in the spongy parts of bones such as ribs and vertebrae. The epidermis is the outermost layer of skin, and is composed of four to five layers of tissue. Both bone marrow and the epidermis play important roles in the regeneration of tissues of the body...
The soft inside partof bones is called bone marrow.Some tough parts of your body are made of cartilage. Cartilage is not as hard as bone,but it is strong. Cartilage can also bend. The outside parts of your ears are made of cartilage.So is the tip of your nose. Some bones have ...
Some bones have cartilage on their ends. The cartilage helps keepthose bones from rubbing against each other.判断正误,写T或F。1. You cannot see your skeleton because it holds you up from the outside.2. Your skeleton is made of bones.3. All parts of bones are hard.4. Cartilage is ...
Why does the lack of control drive the deepest anxiety I have ever felt in the marrow of my bones where I swear I will drown in it and feel as if I am drowning regardless? I am often asked to trust only as swiftly as I am reminded not to. Then there is love, if and when I ...
Distension of the collateral pouch immediately distal to the proximal ses- amoid bones confirmed accurate placement of the nee- dle. A No. 11 scalpel blade was used to create a small (2–3 mm) portal into the digital sheath immediately dis- tal to the proximal sesamoid bone. An ...