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Because a single cell isn't very complex. The more cells an organism has, the more it can specialize it's cells, such as all the specialized cells that make up your brain, stomach, skeleton, muscles, etc. An organism that is made up of only one cell, that one cell has to do everything that each of our specialized cells do.
What else can I help you with?
Are animalia unicellular or multicellular?
A sea star is multicellular.
Is a mushroom multicellular or unicellular?
A mushroom is multicellular.
Is a mushroom unicellular or multicellular?
A mushroom is multicellular.
Is a cat unicellular or multicellular?
A cat is multicellular. Multicellular organisms have more than two cells. A multicellular organism is one that can be seen without the need of a microscope.
Is a sponge a multicellular or unicellular organism?
A sponge is a multicellular organism.
Is a tree a multicellular or unicellular?
It is multicellular
Is a platypus multicellular or unicellular?
Platypuses are multicellular. All mammals, and indeed all vertebrates, are multicellular.
Is cnidaria unicellular or multicellular?
cnidarians are multicellular
Is a grizzly bear unicellular or multicellular?
A grizzly bear is a multicellular organism.
Is hydra multicellular?
Yes, Hydra is Multicellular.
Is mold unicellular or multicellular?
Bread mould is multicellular.
Are cows unicellular or multicellular?
Cows are Multicellular organisms. Hope you Like it!.
Is a monkey multicellular or unicellular?
Monkeys are multicellular organisms.
Is a tulip plant multicellular or unicellular?
the answer is the plant is multicellular
Are mildew unicellular or multicellular?
multicellular
Are crustaceans multicellular or unicellular?
multicellular
Is amphibians unicellular or multicellular?
Multicellular
