An independent variable is a variable that is controlled in the experiment to test whether there will be an effect on the dependent variable. So in the experiment, the independent variable is the color of the feeder because Jamal wants to know if there is an effect if he uses red feeders on the hummingbirds. This is the one being controlled by Jamal because he can use a variety of colors of the feeders.
Answer:
In ancient times, it was easier to travel by boat than over land. Few roads existed during this time. Also, because of the rivers, this area had arich supply of fish and waterfowl that could be used for food. The land in this area was flat and fertile, rich in nutrients.
Explanation:
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Klaus has been diagnosed not only with the major depressive disorder but also generalized anxiety disorder. In this case, Klaus's case illustrates comorbidity. Hence, Option A is correct.
<h3>What is comorbidity?</h3>
Comorbidity is that situation of or can be termed a condition that has a direct impact on the quality of life that is spent by someone. For a better understanding of comorbidity, an illustration will be taken.
For instance, when a person is diagnosed with diabetes and also suffering from depression. When they visit a doctor for treating diabetes, they should also remember that depression also affects overall health.
Thus, depression is comorbid. Option A is correct.
Learn more about comorbidity here:
brainly.com/question/7495772
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The correct question is attached in text form:
Klaus has been diagnosed not only with the major depressive disorder but also generalized anxiety disorder. Klaus' case illustrates:
A) comorbidity
B) etiology
C) prognosis
D) prevalence
A) comorbidity
Yes, Louisiana Purchase allowed for it
