What is one physical benefit that can be obtained from participating in field events? A) strengthen balance
B) better sleep pattern
C) increase capacity for learning
D) all of the above

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frequency or wavelenth of em radiation in a vacuum

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.