Which factor explains why coal dust is explosive?temperature
surface area
concentration
addition of catalyst

Answers

Answer 1

Answer: The answer to the question stated above is surface area.
Coal dusts are fine powdered form of coal, which are formed by crushing, grinding, or pulverizing of coal. They can be created during mining, transportation, or by mechanically handling coal because of its brittle nature.
The surface area of the coal dust explains why it is explosive.

Answer 2

Answer:

Answer:

surface area

Explanation:

I got it right on Plato.

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If 15% of a DNA sample is made up of thymine, T, what percentage of the sample is made up of cytosine, C?

Answers

If 15% of a DNA sample is made up of thymine, T, then the percentage of the sample that is made up of cytosine, C is 35%.

What is DNA?

DNA stands for deoxyribonucleic acid. It may be characterized as the type of molecule inside cells that contains the genetic information responsible for the development and function of an organism. It is considered one of the most common types of genetic material.

According to Chargaff's rule, the amount of adenine is always equal to the amount of thymine while the amount of guanine is always equal to the amount of cytosine.

The amount of thymine in a DNA sample = 15%

Then, the amount of adenine = 15%

Total amount of DNA = 15 +15 = 30%.

The amount of DNA left = 70% which holds guanine and cytosine in equal amounts. So, the amount of guanine = 35%, and the amount of cytosine = 35%.

Therefore, if 15% of a DNA sample is made up of thymine, T, then the percentage of the sample that is made up of cytosine, C is 35%.

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If 15% are Thymine, and Thymine always pairs with Adenine, then Adenine is also 15%. The remaining bases, amounting to 70% would be equally divided between Cytosine and Guanine, since they always form pairs. So 35% would be the answer.

Which is an abiotic factor of a marine ecosystem

Answers

The water temperature, the speed of currents, the oxygen content, pollution, ect.

The factors that affect aquatic ecosystems is the rate of water flow, salinity, acidity, oxygen, light levels, depth, and temperature.

How did the changes in the composition of the Earth's atmosphere affect the evolution of life?

Answers

in the early atmosphere, the earth had no trees, and the gases were mainly, carbon dioxide, methane and nitrogen. no oxygen.

when plants began appearing, it increased oxygen in atmosphere, and decreased carbon dioxide, which was also dissolved into oceans forming within sedimentary rocks.

this increase in oxygen continued, and helped create human life.

Answer:

rising temperatures, droughts, shifting patterns of precipitation and longer growing seasons, plants and animals are evolving to keep pace. Biologists have observed squirrels and salmon developing at an accelerated pace, causing them to reproduce at a younger age.

Where does the most absorption of nutrients take place?1. liver
2. small intestine
3. large intestine
4. stomach

Answers

The most absorption of nutrients take place in small intestine. The correct option is B.

Thus, The digestive system's small intestine is where the majority of nutrition absorption takes place.

Villi and microvilli, small finger-like projections that line its walls, significantly increase the surface area that can absorb nutrients.

These structures make it easier for nutrients like carbs, proteins, lipids, vitamins, and minerals to enter the bloodstream and be carried to the cells of the body where they can be used for energy and other purposes. The liver and other organs process the nutrients that have been ingested after that.

Thus, The most absorption of nutrients take place in small intestine. The correct option is B.

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Answer:

It's intestine but partially small intestine

If element X has 15 protons, how many electrons does it have?

Answers

If element X has 15 protons, it would also have 15 electrons.

If the element has 55 protons it is celcium and it also has 55 electrons. It has an atomic mass of 133 (132.9) so to get the number of neutrons you subtract the atomic mass and the number of protons.

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