Which of the following is a difference between primary and secondary succession?
A. Primary succession describes the evolution of plants, and secondary succession describes the evolution of animals.
B. Primary succession is the start of evolution, and secondary succession occurs when there is a mass extinction.
C. Primary succession only occurred once, when life first evolved on earth billions of years ago.
D. Primary succession occurs after severe disturbances or on new land unoccupied by life, and secondary succession occurs after a less severe disturbance to an existing community.
E. Primary succession is much more common than secondary succession.
Ans: D. Primary succession occurs after severe disturbances or on new land unoccupied by life, and secondary succession occurs after a less severe disturbance to an existing community.
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To be useful to scientists, a hypothesis must be ________; in other words, the hypothesis must be able to be confirmed or discredited.
Fill in the blank(s) with the appropriate word(s).
The increased mortality of coniferous trees in the Pacific Northwest between 1955 and 2007 is an example of a
reaction to ____.
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Adaptations that exert a strong competitive force on a predator are the result of coevolution
____________________ Indicate whether the statement is true or false.