Environmental Science
A food web is

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
Like a food chain

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Environmental Science
The north-facing side of a hill in a mountainous region in the US tends to:

Receive less sunlight during a year than the south-facing side
Grow a variety of trees that are typically observed at higher elevation
Have snow on the ground for a longer period of time in winter compared to the south-facing side
All of these
Be a better location for a ski run than the south-facing side

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