The greatest loss of biodiversity in the last two centuries has resulted from
A) the introduction of alien species to new ecosystems.
B) the use of fossil fuels to power transportation and electrical production.
C) the physical alteration of habitats.
D) the use of rivers, lakes, and oceans for transportation.
C
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Why is there virtually no hydrogen and helium present in the atmosphere today?
A) These gases were burned off by solar radiation. B) The gravitational force of Earth was not strong enough to hold them. C) These gases were consumed by rock-forming processes. D) Acid rain removed these gases from the atmosphere.
Carbon dioxide is the major gas in the atmosphere of Venus
Indicate whether the statement is true or false
Which of the following locations would have the highest specific humidity?
A) A
B) B
C) C
D) D
Which of the following products contains the greatest number of carcinogens?
A) A thick vanilla milkshake B) A Twinkie snack C) Chewing tobacco D) Tap water from most cities in the United States