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having tiny holes and spaces throughout the inside of something, much like a sponge.

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Tissue engineering

doctors performing surgery
Organ transplants are complicated surgeries that take hours and hours to finish. Teams of doctors are often needed. Image by Tiiu Sild.
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Where Does Development Happen?

Lower spine

Evolution Detective: The Case of the Broken Bones

Andrew Burchill
Humans can suffer from certain back problems in their old age, but other very similar animals don’t have the same issues. Why might this be the case?
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