Define frequency:

the distance from the rest position to a crest or a trough; the more energy, the greater the amplitude

a repeated back-and-forth or up-and-down motion.

the part of a longitudinal wave where the particles are far apart

the number of waves that pass a set point in a certain amount of time

Which type of respiration takes place when there is no oxygen present

Which law represents a balanced chemical equation?

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.