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Why is milk a colloid substance structurally? Is the grand canyon considered an ecosystem? If an equilateral triangle has sides of (3x^2 + 8x - 1), what is its perimeter? I know a train at a high rate of speed will total a car, but would a train at ONLY 5-10 MPH total a car? Rewrite the set R by listing its elements. Make sure to use the appropriate set notation. =Rzz is an integer and <−3≤z1?