Answer:
C)caffeine is the independent variable
Explanation:
Caffeine is the independent variable and word recall is the dependent variable. Word recall is dependent on the presence or absence of caffeine.
There are several modifications that has taken place in the environment all around the world. This has happened mostly because of the actions of humans as we have gone to an extent to fulfill our needs without thinking of the impact on the environment.
There have been many environmental modifications over the years and some of them are:
- The overall temperature of the earth has increased that is caused the glaciers to melt.
- Because of the greater use of automobiles, the exhaust from it has caused the formation of bad ozone layer.
- Because of the excessive use of pesticides, the quality of the soil has degraded that has hampered the quality of the food.
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