Which reptile group is considered to be the immediate ancestor of mammals?
a. captorhinomorphs
b. pelycosaurs
c. labyrinthodonts
d. therapsids
e. coelacanths
d
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Assuming a household water consumption of 70 gallons per day per capita, what was the total amount of water that was consumed during 2010 by all of the people in the United States? (Note: The population of the United States in 2010 was about 309 million people.) How much water would have been saved if the per capita consumption was reduced to 60 gallons per day?
What will be an ideal response?
Dry stream channels in deserts of southwestern North America are called:
a. dry washes b. arroyos c. dry valleys d. both a and b
How would we use isotopic ages to infer the ages of the upper and lower unit in this diagram?
A. An age on the dike would not help us because it is an igneous rock. B. The upper unit would be older than an age determined on pebbles of the dike in that unit. C. The dike is younger than the lower unit but older than the upper unit. D. The lower unit would be younger than an age on the crosscutting dike.
The boreal forest is
A. characterized by tolerating a wide variety of temperatures and precipitation. B. dominated by coniferous trees. C. located where soils are typically dry. D. found in warm but not hot areas.