between birth and adulthood the brain in volume.

 Brain loses 5 to 10% of its weight between the ages of 20 and 90. One study found that the volume of the brain was 15% less in older adults than in younger adults. On average, the brain loses 5% to 10% of its weight between the ages of 20 and 90 years; brain volume also decreases.

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the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.