Environmental Science
The gas responsible for the greenhouse effect on Venus is:

Ozone (O3)
Water vapor (H2O)
Carbon dioxide (CO2)
Oxygen (O2)
Nitrogen (N2)

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Environmental Science
Definition of ecosystem is

The abiotic component of a habitat
A community of organisms interacting with one another
The part of the earth and its atmosphere which inhibits living organisms
The community of organisms together with the environment in which they live

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