Answer:
Maintaining constant water and salt concentration (osmoregulation), keeping a constant temperature of the body and excreting waste substances.
Because there is genetic variation among the newly reproduced organism.
Of the total amount of glucose energy consumed by the body each day, about 20% is used by the brain and nerve cells.
The brain constitutes about 2% of the total body but it is one of the main consumers of energy derived from glucose.
The energy provided by glucose is used for the proper functioning of the brain. It generates ATP which is an energy source that is responsible for r neuronal and non-neuronal cellular maintenance and generates neurotransmitters.
Thus glucose-derived energy is critical for the health of the brain. Lack of energy can cause several brain diseases.
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One is through turgidity. this occurs before ground tissue ( collenchyma and sclerenchyma cells) become well developed to give structural support to the plant as it grows bigger. The xylem tissue (composed of rigid tissue) of the young plant render this support and also maintaining osmotic turgidity of the surrounding plant cells.
