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3. Explain the reason in one line for the statements below:
a. Sun is the source of all the energy in the world.
b. If human beings destroy grasslands, the population of zebras will go down
c. As we go up the food chain, the amount of energy available decreases.
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A.1-The energy of the sun is the original source of most of the energy found on earth. We get solar heat energy from the sun, and sunlight can also be used to produce electricity from solar (photovoltaic) cells. The sun heats the earth's surface and the Earth heats the air above it, causing wind.
A.2- As Zebras feed on grass and Grass is the only thing they consume, thus destroying grasslands directly results into the going down of zebras' population.
A.3- Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level.
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