Hakeem is testing the effects of sunlight on samples of soil. Which of these actions would introduce confounding variables into
Hakeem’s experiment? He tests a theory that’s already been established.
He tests multiple hypotheses at a time.
He uses identical specimens when completing multiple trials.
He adjusts the independent variable and records the effects.
He uses different types of soil in each of his samples.
A confounding variable refers to an external effect, which modifies the influence of an independent and dependent variable. This extraneous effect is used to affect the outcome of an experimental design. The confounding variables can ruin the experiment and can generate unnecessary outcomes.
In the given case, confounding variables can be introduced by testing multiple hypotheses at a time and by using distinct kinds of soil in each of the samples.
The correct answers are "He tests multiple hypotheses at a time" and "He uses different types of soil in each of his samples".
Explanation:
Confounding variables are factors that are not taken into account while performing an experiment, and can ruin the results by introducing bias or by giving false positive or negative results. Confounding variables must be avoided in any experiment, which must be designed to test only one variable at the time. In this case Hakeem would introduce confounding variables if he tests multiple hypotheses at a time or if he uses different types of soil in each of his samples. This two scenarios involve testing different variables at the same time, instead of testing just one at the time as it should be.
The name of the enzyme present on the mitochondrial membrane, that allows hydrogen ions to flow through to provide the energy to phosphorylate ADP to form ATP is ATP Synthase.
To help relieve heartburn, a person should take medicine that is 'Over-the-counter (OTC) antacids and acid blockers'.
<u>EXPLANATION:</u>
Heartburn is a very common symptom of a condition called Gastroesophageal reflux disease.
This affects the lower part of the esophageal sphincter and also the muscle ring-like connection between the 'esophagus and stomach' which tends to infuse a backward flow of the stomach secretions.
Along with some dietary and life style changes, the intake of antacids and acid blockers can help in the relieve of the symptoms of occasional heartburn.
