Biosphere is

1. a component in the ecosystem
2. composed of the plants present in the soil
3. life in the outer space
4. composed of all living organisms present on earth which interact with the physical environment

Subtopic:  Introduction to the Chapter |
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Ecological niche is

1. the surface area of the ocean
2. an ecologically adapted zone
3. the physical position and functional role of a species within the community
4. formed of all plants and animals living at the bottom of a lake

Subtopic:  Introduction to the Chapter |
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