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Answer: Tendons
Why: While tendons attach muscles to bones, ligaments attach bones to other bones across joints.
Answer: Loop of Henle
Why: Desert mammals such as kangaroo rats have exceptionally long loops of Henle to survive with minimal water.
Answer: 20 seconds
Why: During hard exercise the same loop can repeat up to six times a minute, because the heart moves far more blood.
Answer: Patella
Why: Babies are born without a hard bony patella, having only soft cartilage that gradually ossifies around age three.
Answer: Arrector pili
Why: In furry mammals, this reaction traps insulating air pockets, but in humans it remains largely an evolutionary leftover.
Answer: Hyoid bone
Why: A Neanderthal skeleton found in 1983 at Kebara Cave in Israel had one almost identical to ours, hinting that Neanderthals could speak.