When you ask you friend for hoemwork answers and he answers like a year later hahahah

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

What causes the formation of ocean currents?

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.