The stinging tentacles of a sea anemone protecting a clown fish which chases away any fish that tries to feed on the anemone is an example of which of the following types of symbiotic relationship?
A) Commensalism
B) Mutualism
C) Naturalism
D) Parallelism
E) Parasitism
B
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A recently cut tree exhibits a very narrow set of tree rings for a period of ten years. What can you hypothesize about local climate during the ten years in which the tree produced the narrow rings?
A. It varied between warm, wet years and cool, dry years. B. It was cool and/or dry. C. It was warm and wet. D. There is not enough data to answer.
What ecosystem services from U.S. national forests had the greatest demands placed on them following World War II and the country's rapid population growth?
A) soil formation and agriculture B) grazing and agriculture C) soil formation and wilderness protection D) food, fiber, and plant growth E) grazing, recreation, and timber resources
What energy source has the lowest net energy yield for transportation?
A. hydrogen B. gasoline C. natural gas D. biodiesel
Another name for the Aurora Borealis is the ________________
Fill in the blank(s) with correct word