B is correct.
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A vector is basically a quantity that has both magnitude and direction.
However , scalars only have magnitude , but vectors possess both magnitude and direction.
Examples of vectors are : Velocity , displacement , acceleration.
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<span>The nervous system has numerous functions including the perception, reception and processing of sensory stimuli, control of the reflexes, voluntary and involuntary motor functions and responses, autonomic muscle functions, homeostatic mechanisms, and relay of motor responses to different parts of the body.</span>
A; information in the DNA of the nucleus can tell skin cells how to develop and perform special functions, which cause a group of these cells to perform similar functions and become skin
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