How do people properly classify organisims​

Sorry two big valves your rpm will go down plus the smaller ones will give you more horsepower your rpm will go up the answer is b

If a system of linear equations has the unique solution (2, −3), then its graph consists of what? parallel lines lines that intersect at a single point identical lines a y-intercept at −3

Which theory of color vision most accurately describes the process of color vision at the level of the retina?