What are the units used to express primary production?
a. pgC/m2/yr
b. ngC/m2/yr
c. ?gC/m2/yr
d. mgC/m2/yr
e. gC/m2/yr
e
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What caused the collapse of the human population on Easter Island from its peak in 1550 CE?
A. A volcanic eruption buried the island in ash in 1588 CE. B. Human activities overwhelmed the environment. C. The society went through a demographic transition. D. A series of tsunami hit the island in 1551 CE. E. Dutch sailors introduced a foreign virus in 1722.
The secondary pollutant ozone is the main ingredient in photochemical smog-a smog that irritates the eyes and forms in the presence of sunlight
Indicate whether the statement is true or false
A squids mouthpiece resembles a ________
A) dog's mouth B) dolphin's blowhole C) parrot's beak D) suction cup E) volcanic crater
The biome with the greatest number of ecological niches and highest species diversity is ________
A) desert B) chaparral C) deciduous forest D) tropical rain forest E) boreal forest