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6. Any physicochemical change of energy in a surrounding environment of an organism that can generate an impulse response in the organism is called a stimulus
Explanation:
the stimulus maybe external like water, temperature, oxygen, air etc where as internal stimulus may be hormone,
nutrient etc
3 . function of cerebrospinal fluid is
CSF act as a shock absorber for CNS thus it protect the brain and spinal cord against external injury
CSF circulates nutrient and O2 to cells of CNS
CSF excreat waste product from brain and spinal cord
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