When an acid is added to a solution a gas is formed. Which of the following ions might be in the solution?
A) CO32-
B) OH-
C) SO42-
D) none of these
A
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Which of these scenarios can occur when a keystone species disappears from an ecosystem? Assume a time frame 100 years between the disappearance and resulting effects.
A. Other species go extinct. B. The population of the rest of the species explodes. C. Speciation occurs. D. Native species become invasive species.
This process involves using plants to absorb and accumulate toxic material. Once contaminants are absorbed into plants, the plants themselves are usually toxic and must be landfilled. The cost of this process can be less than half the cost of landfilling or treating toxic soil.
A) Detoxification B) Phytoremediation C) Composting D) Bioremediation E) Fertilizing
What can occur when organisms are exposed to air and sunlight?
a. Wave shock b. Motility c. Desiccation d. Succession
In general, as countries become more industrialized and developed,
A) use of contraception decreases. B) the cost of raising children decreases. C) people marry at an earlier age. D) support of the elderly increases.