Which biome is found near the polar ice caps?

Which of the following is a consequence of urban heat islands? increased precipitation downwind of the city? increased precipitation upwind of the city? decreased winds within the city? increased winds within the city?

Which of the follow describes a disadvantage secondary sources have compared to primary sources?

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.