Answer:
A) Increased oxygen levels in a pond due to fertilizer run off
Explanation:
When fertilizer is applied to a farm during the day, rain could fall after the application, and as a result of errosion, some amount of the fertilizer could be washed away into the ponds due to run off, and some of the chemical components of fertilizer are poisonous to the fish, development of algae in the pond can reduce light needed in by the fish and oxygen could as well be reduced.
The statement that describes the shift from D1 to D2 is option c: Demand for the product decreased.
<h3>Which causes a change in demand?</h3>
A change in demand is one that is caused by:
- The tastes and preferences of customers
- The the composition or size of the population
- The prices of related goods
- Expectations.
Note that a change in any one of the factors above can determine the quantity people who are known to be willing to buy at a said price and this will cause a shift in demand.
Hence, The statement that describes the shift from D1 to D2 is option c: Demand for the product decreased.
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Three examples of responses in plants and animals that result from internal stimuli and help maintain homeostasis are blood level, temperature, and nutrition levels.
Hope this helps!
