Cumulative Exam — Cumulative exam Answers

Coral reefs are a vast community of individual organisms.

Which of the following is not a characteristic of the source of rivers and streams?a.high oxygen levelsb.freshwater fishc.cooler temperaturesd.murky waters

Energy must be transformed in ecosystems because _______.a.energy cannot be created or destroyedb.an organism’s energy must go somewherec.an organism’s energy must come from somewhered.all of the above

Which of the following best explains why humans need constant supplies of fresh water?a.Humans need a constant supply of water to provide them with essential vitamins.b.Humans need a constant supply of water to maintain proper hygiene.c.Constant supplies of freshwater are needed because body water is continually being lost.d.Constant supplies of freshwater are not actually necessary for survival.

Buffer zones _______.a.can help regulate the acidity of aquatic ecosystemsb.help increase erosion ratesc.are set up around natural resource areasd.all of the above