Some animals, like octopuses, have blue blood because they use copper instead of iron to carry oxygen!
Human Body - Facts for Kids

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Random Facts About Human Body For Kids
The space between your collarbones (your clavicles) helps shield your windpipe (where you breathe) and your food pipe (your esophagus), keeping them safe inside your chest!
Your blood carries antibodies (germ fighters) that remember how to fight diseases you’ve had before!
The cerebellum’s surface layer contains more neurons than any other part of the brain!
Your pancreas never takes a break — it works 24 hours a day, 7 days a week, just like your heart!