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countershading

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definition: 
Protective coloration used by some animals in which parts normally in shadow are light and those exposed to the sky are dark
sentence: 
Because countershading is thought to aid in concealment by reducing shadow in well-lit environments, the hypothesis is partially supported despite no significant associations with other open environments. The countershading of their body is a protective camouflage.
difficulty: 
hard
toefl frequency: 
1
toefl classification: