Peristalsis is a series of wave-like muscle contractions that moves food to different processing stations in the digestive tract. The process of peristalsis begins in the esophagus when a bolus of food is swallowed.
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Image result for Two differences between primary and secondary metabolites
Primary metabolites are not species-specific and thus might be identical in some organisms. Secondary metabolites are species-specific and thus are different in different organisms. Primary metabolites are involved in the growth, development, and reproduction of organisms.Aug 18, 2020
Due to pollution the ozone layer of the Earth is being more and more affected. The main function of ozone is to absorb the Sun's UV radiation. Exposure to UV radiation is known to increase the risk of skin cancers.
Thus, young adults could get higher levels of UV radiation from the sun compared with their grandparents, due to pollution.
Increased sun exposure may also be another cause. Today, it is more and more popular to spend a lot of time at the beach. Traveling to other countries to do this is more accessible today for young adults.
However, tanning beds which are very popular with young people, are another source of high levels of UV radiation.
Abnormal, unhealthy cells develop.
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The correct answer would be (B) affect organisms.
The region marked with X is the region which comes under both long term and short term changes.
Both types of changes affect organisms.
Short term environmental changes such as drought, flooding, volcanic eruption et cetera do not give enough time to the population for adaptation. The population usually either migrate or extinct.
Long term environmental changes such as global warming are gradual changes due to which organisms get enough time to adapt to the changing environment.