Which of the following statement is true?
a. the nitrogen cycle is the most important cycle for life.
b. the oxygen cycle is the least important cycle for life.
c. life can be sustained without any of the cycles for life present.
d. all the cycles of the matter are equally important for life to be sustained

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.