Some trees have red leaves all year long. you know that plants with green leaves make their food for themselves. how do you think trees with red leaves gets its food?

Idon’t quite understand this problem

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90

How can you increase the strength of an electromagnet?