A diagram of the flow of energy through an ecosystem resembles a pyramid. This explains why
A) some ecosystems have a higher primary productivity than others.
B) animals need energy for maintenance.
C) there is more grass than zebras, and more zebras than lions, on the African savanna.
D) not every organism at one level of the food chain is eaten by an organism at the next level of the food chain.
C
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In high temperature and pressure metamorphism, if the parent rock is ________ and the dominant mineral is amphibole then the rock is amphibolite.
A. basalt B. limestone C. lake sediment D. ocean-floor sediment E. granite
The lowest crude death rates are found in countries at which stage of the demographic transition?
A) Stage 1 B) Stage 2 C) Stage 3 D) Stage 4 E) Stage 5
In an aqueous solution thee [OH-] is 1.0 x 10- 6 M. What is the [H+]?
A) 1.0 x 10^-9 M B) 1.0 x 10^-8 M C) 1.0 x 10^- 6 M D) 1.0 x 10^8 M
Which of the following statements about ozone is FALSE?
A) Ozone in the lower atmosphere protects human health. B) Stratospheric ozone absorbs harmful radiation. C) Tropospheric ozone is a component of photochemical smog. D) Ozone in the stratosphere protects human health.