The chart shows data for four heat engines
which lists the engines from most efficient to least efficient?
y, x, w, z
z, w, x, y
z, x, w, y
oy, w, x, z

the answer is definitely c.

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.

there are no components of a physical goal mentioned on the list of choices that you've provided.