4th Nine Weeks Exam--Environmental Factors and Body Systems

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Ponds and rivers are two types of

The role of the respiratory system is to bring what substance into the body?

Which of the following is a biotic factor that could reduce a population of frogs?

In a marine ecosystem, the remora attaches to the belly of a shark and feed off the scraps. The shark is not afffected by the relationship. This is an example of which symbiotic relationship?

Which of the following is MOST responsible for making a fallen tree decay and become an important part of the soil?

Which ecosystem is found where fresh water of a river and salt water of the ocean meet?

In a certain habitat, young deer were the main source of food for wolves. A severe snowstorm kills many of the young deer one year. Which of the following best describes what probably occurred the next year?

Lichen results from a symbiotic relationship between algae and fungi. In this relationship each organism helps the other survive. This is an example of