Which of the following is always true in a chemical reaction

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okay i have so many questions. but the big one here is: um wt..f is this mess? ?

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.