Environmental Science
A food web is

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

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Environmental Science
Frost forms when:

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

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Environmental Science
Lead poisoning

increases O2 carrying capacity of hemoglobin in blood
reduces O2 carrying capacity of hemoglobin in blood
reduces O2 carrying capacity of myoglobin in muscles
increases O2 carrying capacity of myoglobin in muscles

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