$(a)$ Write the full form of $DNA$.
$(b)$ Why are variations essential for the species?

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(N/A) The full form of $DNA$ is $Deoxyribonucleic \text{ } Acid$.
$(b)$ Variations are essential for the species because they provide the ability to adapt to changing environmental conditions. This ensures the survival of the species over time, as individuals with favorable variations are more likely to survive and reproduce in a dynamic environment.

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