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Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

Why do we perceive objects as retaining their brightness under different lighting levels?

Deserts (especially true deserts) are not easy places for animals to live. animals who live in them often have special features that them survive. which adaptation would be for this group of animals? a) keen eye sight b) short, narrow legs c) tolerate heat d) webbed feet