What does Greenberg mean when he says it's not an unusual human characteristic to reduce the world down to very few elements?

The process by which natural forces move weathered rock and soil brim one place to another is called

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.

Why do we perceive objects as retaining their brightness under different lighting levels?