The Fascinating World of Jellyfish: Why Are They Clear?

Jellyfish are aquatic animals related to anemones and coral. They are transparent due to their jelly-like bodies, which are 94% water. Lacking a heart, brain, or bones, they are held together by muscle fibers. Jellyfish feed by using their tentacles to catch prey, and their hollow stomach connects directly to their mouth. They move by expelling water from their stomachs. Most jellyfish inhabit shallow, tropical waters and use their tentacles for protection and hunting. There are around 20 species of jellyfish.

What group of animals do jellyfish belong to?

• Reptiles

• Mammals

• Anemones and Coral

• Birds

What percentage of a jellyfish's body is water?

• 100%

• 94%

• 70%

• 50%

How do jellyfish move forward in the water?

• By flapping their fins

• By pumping water out of their stomachs

• By using their tentacles

• By swimming with their mouths

Where are jellyfish most commonly found?

• In deep ocean trenches

• In shallow and tropical waters

• In freshwater lakes

• In arctic regions

Approximately how many species of jellyfish exist?

• 10

• 20

• 50

• 100