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storchak [24]
4 years ago
5

A hand sanitizer was advertised to be more effective at killing bacteria than any

Biology
1 answer:
Mekhanik [1.2K]4 years ago
4 0

Answer:

Group 4

Explanation:

<em>The control group in this case would be those students in </em><em>group 4.</em><em> </em>

<u>The control group during an experiment is a group that does not receive the treatment administered to other groups and as such used as a standard for measuring the effects of the treatment on other groups. </u>Whatever differences that exist between the control group and the various treatment groups is attributed to be as a result of the treatment administered to the groups.

<em>In this case, group 4 only used warm water for washing their hands instead of the hand sanitizer/soap used by the other groups. Whatever differences found out in the bacterial count in their respective culture swabs can be attributed to the effects of the hand sanitizer/soap.</em>

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Answer:

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<u>Explanation:</u>

The electricity produced using water is called hydropower has benefits like it does not pollute the air. If water is used to produce electricity than every state can produce its own electricity without relying on other states for fuel.

With these benefits, hydropower is very costly and it has several other drawbacks also like it pollutes water and reduces the oxygen level in the water. So it is a threat to wildlife. It reduces recreational activities like swimming, boating, and fishing, etc.

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3 years ago
Alizarin yellow is a pH indicator that transitions from red to yellow when the pH falls from a value of 11 to below 10. Why is p
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The phenol red turns yellow in the presence of an acid, and the change in pH in an alkaline environment can be detected by the red color of phenol red. Growth of E.coli will grow in pH of 10-12 . But, very slowly. The color change in alizarin is also apparent at pH 10.2 to 12 only.

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Hope this will help u

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