In 1950, Africa's population comprised about ________% of the world's total. Today it comprises about ________%
A) 21; 9
B) 10; 20
C) 25; 3
D) 8; 16
D
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Corn (maize) was first domesticated in present-day ________
A) Mexico B) Portugal C) China D) Spain E) Brazil
Which of the following is not an adaptation of desert plants for their environment?
a. toxins in their stems to discourage being eaten b. spines to discourage animals from taking their water c. opening their pores only at night to prevent evaporation d. store water in expandable tissues e. reduced or no leaves
What atmospheric layer is the home of weather, has the greatest density of gas molecules, and has a decrease in temperature with height?
A. mesosphere B. thermosphere C. troposphere D. stratosphere
A(n) ________ detects swelling and possible eruption in a volcano
A) tiltmeter B) anemometer C) seismograph D) ceilometer E) frightened graduate student