Zooplankton populations in Lake Erie and the Hudson River have declined by up to 70% or more since the arrival of zebra mussels because ________
A) zebra mussels feed on cyanobacteria, which zooplankton need as a food source
B) zebra mussels carry a parasite that kills zooplankton
C) zebra mussels prey on zooplankton
D) waste from zebra mussels promotes bacterial growth that kills zooplankton
E) zebra mussels block sunlight penetration into lakes and thus prevent zooplankton from photosynthesizing
C
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Water's temperature increases slowly because some of the energy absorbed is used to ________ instead of to increase the kinetic energy of the molecules
A) break hydrogen bonds B) decrease the specific heat of the water C) create hydrogen bonds D) decrease the motion of the water molecules
Pike's Peak is located 36 kilometers (22 mi) west of Colorado Springs. What is this statement describing?
a. global address b. absolute location c. relative location d. geospatial address e. dynamic location
Biological nutrient removal ultimately converts most of the organic materials in wastewater into
A) oxygen, ammonia, and carbon dioxide. B) nitrogen, water, and carbon dioxide. C) sugars, vitamins, and minerals. D) proteins and carbohydrates.
Which is most likely true for an atom with six valence electrons?
A) It will gain one electron. B) It will gain two electrons. C) It will lose one electron. D) It will lose two electrons.