We have gravity so we do not float in are sleep. It keeps us on the ground. We have eyes to see. We have platelets to create scabs. So we do not bleed to death. Are ears to hear and if you are blind the you rely need it.
The Alien has hands to grab the jellyfish and to swim. The Alien mouth to eat the jellyfish and to breath. It tales to swim around and to knock the life out of it. Eyes to see the jellyfish and to blend in more. It is blue to blend in to the water and the top of the eyes are green to blend in to seaweed.
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Similar cells are bone cells provably because it has arms and long eyes going up and the tail is made up with tissue. We have bone cells, brain cells, skin cells, white blood cells, and red blood cells,