The answer is b. is under purifying selection
Answer:
According to the “hygiene hypothesis,” the problem with extremely clean environments is that they fail to provide the necessary exposure to germs required to “educate” the immune system so it can learn to launch its defense responses to infectious organisms. Instead, its defense responses end up being so inadequate that they actually contribute to the development of asthma.
Explanation:
Law of demand
The regulation of demand for states that because the rate of a great decrease, the amount demanded of that correct increases.
<h3>What are the five Determinants of Demand?</h3>
The five determinants of demand are:
- The rate of the goods or service.
- The earnings of consumers.
- The expenses of associated items or services—both complementary and acquired together with a selected item, or substitutes sold rather than a product.
- The tastes or alternatives of customers will pressure demand.
- Consumer expectancies about whether or not charges for the product will upward push or fall withinside the future.
For combination demand , the wide variety of customers withinside the marketplace is the 6th determinant.
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