Cells. More specifically, connective tissue.
Skin, blood vessels, bones...
This like comparing apples to oranges. All bones vs all skin, bones win.
All the blood cells are produced in the bone marrow But not all bones do that. Bones that do make blood cells include bigger longer bones, like the humerus and femur.
yes of course they have
Periosteum is the membrane that lines the outer surface of all bones, except at the joints of long bones.
Bone marrow inside the bones creates blood when we lose it. Although blood can be lost fast, we reproduce blood very slowly not to lose all of our bone marrow at once.
because all arteries have higher pressure than veins
It depends on what animal you are talking about, Jellyfish dont have bones, but if you are talking about a mammal, Yes.
The 'jelly' is really a rich stock made by boiling all the pork bones, skin and trimmings, gelatine is released from the bones and skin, this is what makes the stock set into jelly.
Probably "Look at you, you're all skin and bones."
NO, they have exoskel so their skin acts as bones, and that goes for all insects.
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