Answer:
Age structure diagrams show the following.
The height of the graph indicates life expectancy.
The width of the base shows birth and fertility rate.
The slope of the pyramid-shaped diagram indicates death rate.
Bends in the graph indicate reductions in birth rate or increases in
death rate.
The overall shape of the diagram indicates whether it is an economically developed country or not.
Explanation:
In a stable human population, the age structure diagram looks like a pyramid with a narrower base. The narrower base depicts that the birth rate is low. A stable human population also has a high number of older individuals. A greater number of older people in a population shows that quality of life is high in that area/country and the population has access to nutritional diet, medical care, and healthcare services. These features of the age pyramid in a stable population indicate a developed country. Age pyramids of underdeveloped countries have a wider base (high birth rate) and narrow tip.
Anaerobic respiration (without oxygen) would caused muscle cells to produce lactic acid. This causes the muscles to ache and in the long term, damages them. Also anaerobic respiration releases far less energy (ATP) than aerobic respiration. So it is best for muscle cells to respire aerobically as they need more energy.
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Inner surface of the small intestine is not flat, but thrown into circular folds, which not only increase surface area, but aid in mixing the ingesta by acting as baffles. Villi: the mucosa forms multitudes of projections which protrude into the lumen and are covered with epithelial cells.