In a recent experiment, anti-bacterial hand sanitizer was compared to hand soap. Students washed their hands using the sanitizer or soap and warm water for two minutes; then they dried their hands with a paper towel. The standard of comparison was rubbing hands vigorously for 2 minutes in warm water, without any soap or sanitizer, and then drying with a paper towel. The sanitizer advertisement claimed to kill bacteria more effectively than any soap. After washing, hands were swabbed and then the swab applied to a culture plate and incubated. Finally, the bacterial cultures were counted. Students using the antibacterial santizer had the lowest bacterial culture count. What is the control in the experiment? A) washing with soap B) rubbing vigorously C) the time: two minutes D) rubbing hands in warm water

Answers

Answer 1

Answer:

Answer:

The correct answer is - option D. rubbing hands in warm water.

Explanation:

The control group or the control is the variable or that is used in an experiment to check if the results are actually due to the experiment or to compare the result or effect of the experiment.

In this experiment, the independent variables are soap and the sanitizer and the dependent variable is the count of bacterial culture. To check the result or to compare the result that results are due to the experiment the control group is rubbing the hand vigorously in warm water.

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Which of the following is not a possible effect of rising carbon dioxide levels on plants?a.
increased photosynthesis
b.
increased plant mortality
c.
increased crop productivity
d.
increased plant growth

Answers

I think the correct answer from the choices listed above is option B. Plant mortality is not a possible effect of rising carbon dioxide levels on plants. This value is a fixed value and cannot be affected by changes in the carbon dioxide level.

Answer:

increased plant mortality

Explanation:

The rise of carbon dioxide in the atmosphere will definitely bring about increased in photosynthesis.

Photosynthesis in plants is a process whereby green plant produces nutrient in the present of sunlight from carbon dioxide and water. Photosynthesis is a necessity for plants to supply nutrient to the plants . The chemical equation for photosynthesis can be represented as follows:

6CO2 + 6H2O sunlight → C6H1206 + 6O2

Photosynthesis converts light energy into chemical energy. Green plants in the presence of sunlight uses CO2 and H2O to produce food. Increase carbon dioxide will definitely increase crop productivity and plant growth. The more the carbon dioxide and water in the presence of sunlight nutrient are added to the plant.

Plant will definitely not die because of rise in CO2.

The picture shows a contractile vacuole of unicellular freshwater

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Answer:

organism, called Paramecium. The contractile vacuole is a specialized organelle responsible for maintaining osmotic balance and regulating the water content within the cell. Paramecium lives in freshwater environments, where water continuously enters the cell through osmosis. The contractile vacuole collects excess water from the cytoplasm and pumps it out of the cell through a series of canals. This process helps Paramecium prevent the cell from bursting due to excessive water intake. The contractile vacuole also helps in removing waste materials from the cell. The picture shows a spherical contractile vacuole with multiple canals leading to the cell's surface, through which water is expelled. Overall, the contractile vacuole is a vital organelle for maintaining the internal balance and survival of unicellular freshwater organisms like Paramecium.

What is a unconformity

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Answer:

An unconformity is an area where the rock layers do not line up. These are caused by erosion or periods without any deposition.

Explanation:

5. Which example demonstrates that all cells come from pre-existing cells?A. A caterpillar feeds on leaves from an oak tree.
B. An oak tree grows from the seed material in an acorn.
C. Water drips from underneath an oak tree leaf in the morning.
D. Sediment from an area where oak trees were cut down builds up alongside a stream

Answers

The example that demonstrates that all cells come from pre-existing cells is an oak tree grows from the seed material in an acorn (option B).

What is the cell theory?

The cell theory is the scientific theory that all living organisms are made of cells as the smallest functional unit.

One of the components of the cell theory is that all cells come from already existing cells i.e. new cells form from cells that are already in existence in a process of reproduction.

The example of this is a tree that grow from a germinating seed. Hence, option B is correct.

Learn more about cell theory at: brainly.com/question/1468725

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B . An oak tree grows from the seed material in the acorn

Manuel releases a pendulum bob. The drawing shows its path. At which point does the pendulum bob have the most gravitational potential energy? A. point B B. point C C. point D D. no differences

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The right answer for the question that is being asked and shown above is that: "A. point B." Manuel releases a pendulum bob. The drawing shows its path. At point B does the pendulum bob have the most gravitational potential energy.

Where do all camels come from?

Answers

The ancestors of camels are believed to have lived 40 million years ago in North America. Afterwards, camels migrated through the middle eastern through Eastern Europe into Asia, Middle East and North America. Camels are of two types; the one humped Arabian camels and two humped Asian camels

All camels originate from middle east and north Africa.

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