Answer:
BIOSPHERE (the region of the earth that encompasses all living organisms: plants, animals and bacteria)
- The existence of Billy, as a living organism, encompasses the biosphere.
- Lions hunt together for food
ECOSYSTEM (consists of all the organisms and the physical environment with which they interact)
- Billy interacted with his brothers. There was a time when he competed with one of his brothers and won.
COMMUNITY (a group or association of populations of two or more different species occupying the same geographical area at the same time)
- Billy belonged to a "pride" or a group of lions
POPULATION (Organisms of a species living together in a group at a particular place)
- Billy fought with his brothers and won. He missed those times when they hunt together in grassland, preying for different species.
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