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Paha777 [63]
3 years ago
7

Zahavi's handicap hypothesis suggests that females:

Biology
1 answer:
blondinia [14]3 years ago
7 0
Use traits that are honest indicators of male quality when choosing mates
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3 years ago
In the same science fair, Tina asks the question "Does caffeine
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In an experiment, the independent variable is a manipulated variable. Due to the fact that you may alter it, it is termed the "manipulated" one. In other words, you can choose in advance whether to raise it or lower it. Only one variable should be changed at a time throughout an experiment.

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When an earthworm is given a stimulant like caffeine, its heart rate rises. Does coffee make an earthworm's heart beat faster? is the research topic upon which the experiment is based. The effect of coffee is the independent variable in this research question, and the response it causes is a change in heart rate (the dependent variable) This brings us to the following theory: "If an earthworm is given a stimulant like caffeine, then its heart rate accelerates."

To know more about manipulated variable refer to:  brainly.com/question/11505552

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