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They are all animals
All animals have to go throw pregnancy first which is common in all female animals.
They all have 'a' for an article. ;D
They all eat have eyes or
Deserts occur on all seven continents and there are no animals common to all.
2 common animals are the raccoon and the bear
All animals in antarctica have fat deposit under their skin.
Teeth because all animals need to chew their food.
they all have brains
they are animals and that's it
Cell walls !
they are all animals