Sinkholes result from ________
A) building on floodplains
B) overconsumption of water from aquifers weakening the substrate
C) substrates that become weak following rain
D) poorly drilled wells in soft soils
E) flood damage and chemical erosion
B
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A black walnut (Juglans nigra) emits a chemical that may kill or inhibit the growth of other nearby shrubs or trees without harming itself. This is an example of which symbiotic relationship?
A) Parasitism B) Mutualism C) Commensalism D) Amensalism
What data is used in computer models run by climate scientists, and what exactly do the models tell us?
What will be an ideal response?
One of the skin-irritating components of poison oak is tetrahydrourushiol:
The long, nonpolar hydrocarbon tail embeds itself in a person's oily skin, where the molecule initiates an allergic response. Scratching the itch spreads tetrahydrourushiol molecules over a greater surface area, causing the zone of irritation to grow. Is this compound an alcohol or a phenol?
A. an alcohol because of the hydroxyl groups it contains B. a phenol because of the hydroxyl groups attached to the benzene ring C. both a phenol and an alcohol because of the hydroxyl groups it contains D. neither an alcohol nor phenol because it contains two hydroxyl groups instead of one
Half the people on the planet live within sixty miles of a coastline and twenty-five percent live within six miles of the coast
Indicate whether the statement is true or false