How many kilograms of biomass at the primary producer level would be required to support 20 kilograms of biomass at the tertiary consumer level?
A. 20
B. 10
C. 200
D. 2,000
E. 20,000
E
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Imagine that a researcher has discovered a 500 million-year-old leaf fossil from the Cambrian Period. He notices that the leaf had very few stomata compared to present-day leaves
What does this tell the researcher about atmospheric CO2 levels during the Cambrian Period? A. Atmospheric CO2 levels were higher during the Cambrian Period compared to today. B. Atmospheric CO2 levels were lower during the Cambrian Period compared to today. C. Atmospheric CO2 levels during the Cambrian Period were equal to present-day levels. D. Nothing, as CO2 was not part of Earth's atmosphere during the Cambrian Period.
The Cretaceous is the most recent period of the ____ era
a. Paleozoic b. Cenozoic c. Mesozoic d. Proterozoic e. Archaean
The range of all factors that influence whether
a species can obtain resources essential for survival and reproduction is its a. habitat. b. niche. c. carrying capacity. d. ecosystem. e. community.
Animals infected with Leptospira interrogans shed this organism in their
a) urine. b) blood. c) sputum. d) saliva.