Some regions of Iceland once were covered with forests. However, centuries ago humans logged the trees and grazed sheep on the logged regions, preventing natural regeneration. This situation, in which one ecosystem has now been converted to another, represents
A) a tipping point for this ecosystem with fewer ecosystem services than before.
B) the power of natural resilience mechanisms.
C) reverse ecological succession.
D) a sustainable approach to ecosystem management with a positive feedback loop.
A) a tipping point for this ecosystem with fewer ecosystem services than before.
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If you have one molecule of TiO2, how many molecules of O2 does it contain?
A. Three, TiO2 contains three molecules. B. Two, TiO2 is a mixture of Ti and 2 O. C. One, TiO2 is a mixture of Ti and O2. D. None, O2 is a different molecule than TiO2. E. none of the above
From which time period would you expect the most abundant and best preserved fossils?
a. Hadean b. Archean c. Paleozoic d. Mesozoic e. Cenozoic
An elongated zone of low pressure is known as a ________
Fill in the blank(s) with the appropriate word(s).
Where is continental rifting currently taking place?
a. in the East African Rift Valley b. at the East Pacific Rise c. at the Mid-Atlantic Ridge d. along the Cascade Mountains e. between India and the rest of Asia