Answers

2016-01-04T19:29:39+05:30
The animals don't have cell wall because they don't need it. Plants have cell wall as it give rigidity to plants to stand still, they don't have bones.
While animals are moving organism and if they have bones there will be difficulty to move, so they have bones instead of cell walls
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2016-01-05T20:46:55+05:30
Because they don't need it as it will cause difficulty in moving as they have bones
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