Explain where the energy in an ecosystem comes from and how it is distributed to all living things in that ecosystem.​

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Explanation:

 The vast majority of energy in food webs originates from the sun. Energy is not recycled in ecosystems and each ecosystem requires a continuous input of energy to sustain it. There is some energy transformed at each level of the food chain or food web in an ecosystem. Energy that is not used in an ecosystem is eventually lost as heat. Energy and nutrients are passed around through the food chain, when one organism eats another organism. ... In each case, energy is passed on from one trophic level to the next trophic level and each time some energy is lost as heat into the environment.

Explanation:

of those who start drinking before they're 15 will develop alcohol dependence

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