Environmental Science
Most of the radiation emitted by a human body is in the form of:

Humans do not emit electromagnetic radiation
Visible radiation but is too weak to be visible
Ultraviolet radiation and is invisible
Infrared radiation and is invisible

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Environmental Science
The main reason why vegetables take longer to cook in boiling water at high altitudes is because:

There is less oxygen in the air at high altitude
The temperature of the boiling water decreases with increasing altitude
Saturation vapor pressure decreases with increasing altitude
Water boils at a higher temperature with higher altitude

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Environmental Science
Definition of ecosystem is

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

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