25.The diagram shows some organisms in an Antarctic food chain. Sun-Algae Krill Cod-Seal-
Which BEST describes the role of krill in this food chain?
A. producers
B. decomposers
C. primary consumers
D. secondary consumer

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

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?