Question

how do different organisms have different body design​

Answer 1

Variation in the DNA coping and due to sexual reproduction is the only property which gives the basic difference in the body design. Thus after a long period of time, due to evolution in various environmental conditions organisms have a varied body design, which ultimately helps in its survival.

Answer 2

DNA copying is needed because information stored in DNA is used to e make protein. Synthesis of different proteins will lead to altered body design. Thus, reproduction at its most basic level involves making copies of the blueprints of body design.
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