Biology, 21.10.2019 18:00 larueeee25

Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. the researchers grew one type of bacteria in twenty-four identical covered petri dishes. then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. they left the remaining six petri dishes closed as a control group. when the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. the researchers concluded that not using any hand sanitizer would lead to the least bacterial growth.

which statement best explains why the researchers’ conclusion was not justified?
the experiment tested too many variables.
the control group was not treated the same as the experimental group.
the sample size of twenty-four petri dishes is not large enough.
the single type of bacteria is not adequate to make any conclusions.

Answers: 1

Show answers

Another question on Biology

Biology, 22.06.2019 05:40

The body of water found at number 4 on the map above is the

Answers: 1

Answer

Biology, 22.06.2019 12:30

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.

Answers: 1

Answer

Biology, 22.06.2019 13:10

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data.

Answers: 1

Answer

Biology, 22.06.2019 15:00

How do temperature and salinity affect deepwater currents? they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water.

Answers: 1

Answer

You know the right answer?

Researchers conducted an experiment to identify the effects of three different hand sanitizers on th...

Questions