Domains of Life; Prokaryotic vs. Eukaryotic Cells

ID #1000

Why don't animal cells need cell walls?

The easy answer is that animals just evolved that way. But a more thorough answer is that animals developed tissues, organs, and organ systems which A) gave rise to the need for cells to be able to connect to each other physically, and B) eliminated the need for individual cells to be protected from the outside world. A bacterial cell typically needs a wall around its membrane for protection from the elements, but a human has skin. Those skin cells, though, need to be connected to each other to maintain that "covering."

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