Alcohol,nicotine, and caffeine.
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<span>An ecosystem<span> consists of a community of organisms together with their physical environment.
</span><span>Ecosystems can be of different sizes and can be marine, aquatic, or terrestrial. Broad categories of terrestrial ecosystems are called </span>biomes.
In an ecosystem, both matter and energy are conserved. Energy flows through the system—usually from light to heat—while matter is recycled.
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Example - </span>a community<span> consists of all the populations of all the species that live together in a particular area. </span></span>
Answer:
Biosphere
Explanation:
It is biosphere because Biosphere refers to the area of the Earth or part of the ecosystem where living organisms lives , contain biogenic organic matter and it's also include ground and air.
It comprises of the area of water, air and land that support life or survival of living organisms.