They're called endorphins!
<span>Answer D hop you get it </span><span>Answer</span>
Bones: they lose calcium, becoming crispy
Muscle: they lose mass
Cartilage: becomes stiffer, but it does not make airway more rigid
D) connective tissue: It includes bone, blood, and lymph tissue, giving support to the skin and internal organs, becoming increasingly stiff when aging.
It should be connective tissue.
Answer:
I think it is either the first or the second one
Explanation:
Nuclear reactors use hydrogen and they are an up and coming energy source.
There are also hydrogen fuel cells.
