Environmental Science
Frost forms when:

All of these
Water vapor changes into ice without first becoming a liquid.
Objects on the ground cool below the dew point temperature.
The dew point is 32oF or below.

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Environmental Science
A food web is

Like a food chain
The set of prey species that are consumed by animals in an ecosystem
A set of interconnected food chains, illustrating the tropic relationships among species
The tropic (feeding) levels that can be observed in an ecosystem

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