Which of the following describes a properly controlled experiment?

which fossil fuel has had the most significant influence on human transportation over the last centrury?

givi [52]

Answer:

Oil is the world's primary fuel source for transportation

Explanation:

Fossil fuels mainly coal, Oil and natural gas are the world's primary energy source. Fossil fuels formed from Organic matter over millions of years.

Oil is a source of transportation and it is obtained from the underground reservoirs. Then the crude oil is refined to obtain fuel oil, liquid petroleum, gasoline etc. Crude oil also used to make other products such as pesticides,fertilizers etc

Coal is used to generate electricity. Around 30% of the power supply in United states mainly due to coal. China is world's largest producer of coal and supplied to all over the World.

Natural gas also used to generate electricity, commonly used in buildings and industries.

4 0

4 years ago

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Describe the location of the digestive enzymes produced by the small intestine, and explain how these cooperate with pancreatic

Karolina [17]

Answer:

The pancreas contains exocrine glands that produce enzymes important to digestion. These enzymes include trypsin and chymotrypsin to digest proteins; amylase for the digestion of carbohydrates; and lipase to break down fats.

Explanation:

3 0

3 years ago

Hiiii people...I need help plsss and thx:)

kow [346]

I’m pretty sure the answer is A or c

I hope this helps narrow down choices

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3 years ago

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Classify the items as being a cause or an effect of water pollution

Pavlova-9 [17]

Answer:

industrial wastes dumped into rivers

Explanation:

Because when factory and other industries dumped their wastes into water they begin to react on environment and fishes will die and that water or river smell so bad

4 0

3 years ago

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Help me Please :)

Jobisdone [24]

1. Where does most of the mass that makes up living things (the mighty sequoia tree for example) come from?

A.Oxygen

B.Soil

C.Carbon Dioxide

 D.Water 

2. Which process is responsible for moving carbon from the atmosphere to the producers in an ecosystem?

A. PHOTOSYNTHESIS: where the carbon dioxide (CO2) is turned into glucose (C6H12O6) 

B. CELLULAR RESPIRATION: where the glucose (C6H12O6) is turned into carbon dioxide (CO2)

C. DEFECATION: When an animal poops, carbon goes back into the atmosphere

D. EATING: When animals eat, they take in the carbon from the atmosphere

3. Which process is responsible for moving carbon from a producer/herbivore/carnivore/decomposer back into the atmosphere?

A. PHOTOSYNTHESIS: where the carbon dioxide (CO2) is turned into glucose (C6H12O6)

B. CELLULAR RESPIRATION: where the glucose (C6H12O6) is turned into carbon dioxide (CO2)

 C. DEFECATION: When an animal poops, carbon goes back into the soil 

D. EATING: When animals eat, they take in the carbon from the atmosphere

4. Which of the following are examples of organic carbon?

A. Lipids

B. Carbon Dioxide

 C. Glucose 

D. Both A and C

E. All of the above

5. Which of the following best describes ALL the possible places carbon can go once it is in an acacia tree in the savanna?

**Read carefully, there are correct answers and then there is the BEST answer**

A. The carbon will either go back into the atmosphere by cellular respiration or into an herbivore when they eat the leaves of the acacia tree.

B. The carbon could go into a lion or be used to become part of the acacia tree (biosynthesis)

 C. The carbon would move to the soil where the decomposers would put it back into the atmosphere. 

D. The carbon could go into the atmosphere through cellular respiration, it could become part of the acacia tree (biosynthesis), it could die and move to the soil, or an herbivore could eat the leaves of the acacia tree

3 0

4 years ago