The half-life of a radioactive elements such as carbon 14 is the time it takes for half of the Atoms to decay. how many half life periods have passed if a fossil contain 1/32 of The original amount of time of carbon 14?

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.