Throughout the year, areas of the Earth's surface are either tilted away from the Sun or toward the Sun. This is a result of the Earth tilting on its axis. What is the main impact of this phenomenon? A. It causes tides.

B. It generates winds.

C. It produces seasons.

D. It influences ocean currents.

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

20 the compound al(nh3)2 has atoms of nitrogen.