Bones have a hard coating to protect the nerves, marrow and blood vessels located in the cavity,
Spiders do not have bones. They are arthropods, their soft tissues are contained inside a hard external coating called an exoskeleton.
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soft you can bend and hard you can not
Seal's bones are hard.
Calcium makes bones and teeth strong as it is like the enamel coating your teeth and bones.
All bones are light, marrow bones are soft and compact bones are hard.
Periosteum
Spiders do not have bones. They have exoskeletons which is a hard outer shell.
Hard.
Yes bones are as hard as rock they can take up to 1,000 pounds of pressure
Because egg has calcium coating
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