How many hearts does an octopus have?
An octopus has three hearts: two pump blood through the gills and one pumps it to the rest of the body.
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- What is the immortal jellyfish?
“The "immortal jellyfish" can turn back into an earlier life stage when it's stressed, possibly letting it avoid dying of old age.”
Reference: Smithsonian Ocean
More from this shelf
Do jellyfish have brains?
Jellyfish have no brain, heart, or bones, and their bodies are about 95% water.
What mold produces penicillin?
Penicillin comes from Penicillium mold, the same group of molds you might find growing on old bread or fruit.