Which of the following natural resources cant be reused

1 answer:

6 0

Hi there! Air and sunlight can definitely be reused. Those are abundant and renewable resources. Therefore, A and D are eliminated. There is a limited amount of water, however, it's impossible to run out of it to the point that there's no more on Earth. C is out. The only answer choice that makes sense is coal, because it's a nonrenewable resource, and it takes millions of years to make more of. It's a fossil fuel, so once we use them up, we can't get anymore during our lives. The answer is B: coal.

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Cellulose could provide an abundant and cheap form of glucose for humans. Why is cellulose not a source of nutrients for humans?

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Answer:

Option (c).

Explanation:

Cellulose is one of the most important carbohydrate of the plant that provide structural framework to the plant cells. Cellulose is made of the monomer of the glucose that are linked through the beta glycosidic linkages.

Although cellulose contains large number of glucose but it cannot be used as the nutrient source for humans. Humans and other vertebrates lacks the enzyme cellulase that is required for the digestion of cellulose. Cellulose cannot be broken down in the human body.

Thus, the correct answer is option (c).

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And organism too

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Answer:

1: Balsatic

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Explanation:

I did an investigation of the volcanoes

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A PNP transistor is connected in a circuit so that the collector-base junction remains reverse biased and the emitter-base junct

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Here are the choices:

A. the output current will be much smaller than the input current.
B. the output voltage will be much larger than the input voltage. 
C. the output voltage will be much smaller than the input voltage. 
D. the output current will be much larger than the input current

The correct answer is letter B. the output voltage will be much larger than the input voltage.

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