Environmental Science
The main reason(s) for warm summers in northern middle latitudes is that:

All of these
The earth is closer to the sun in summer
Only (b) and (c) are correct
The sun is higher in the sky and we receive more direct solar radiation
The days are longer

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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
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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