The cell membrane is a flexible structure that surrounds both plant and animal cells. The arrangement of molecules within the cell membrane makes it semi-permeable. That is, the cell membrane allows some substances to easily diffuse into and out of the cell, but it prevents the diffusion of other substances. Plant and animal cell diagram

The cell wall is a rigid structure that surrounds plant cells. The materials found in the cell wall protect the plant cells and give plants structural support.

Explanation:

Plant cells are also able to become longer as they grow. ... Cell elongation does not occur in animals. The cells of multicellular animals and plants must also differentiate , so that its cells develop features that enable them to fulfil specific roles. Cells that have differentiated have become specialised.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

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you can have just about every answer you can think of