Homeowners living in a heavily forested region surrounding a small 3-acre pond in Missouri decided to reduce air pollution in their neighborhood
In the fall, after the oak and maple leaves had fallen, the homeowners blew all of the dead leaves into the pond. About 8 months later, in July, they noticed a large number of dead fish in the pond. What is the most likely cause of the fish kill? A) The dead leaves released poisons that killed the fish
B) The bacteria decomposing the leaves depleted the levels of oxygen
C) Bacteria fed on the leaves and then the bacteria infected the fish
D) Carbon dioxide from the decaying leaves reached toxic levels and killed the fish
B
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Stream discharge calculates:
a. the distance that a water packet can move along the stream in a given period of time b. the mass of water in stream moving past particular point in a given period of time c. the volume of water passing through a cross section of the stream in a given period of time d. the loss of stream water due to evaporation and infiltration
Which of the following best describes the human population from early times to the present?
A) early rapid growth, which has increased rapidly in the last 20 years B) early rapid growth, which has leveled off to a nearly constant rate in the last 20 years C) slow, uneven growth until the 1800s, then increasingly rapid growth D) rapid, explosive growth throughout the period E) slow, steady growth throughout the period
What is the dominant organism colonizing bare rock during primary succession?
A. lichens B. algae C. bacteria D. submergent plants
____ may be the most important weather element in terms of the impact on humans
a. ?Volcanoes b. ?Temperature c. ?Precipitation d. ?Tornadoes e. ?Clouds