Why did the United States and the Soviet Union begin experimenting with and trying to improve the V-2 rocket?
A. To understand the atmosphere
B. To increase national security
C. To improve science education
D. To build colonies in space

Which of these is least likely to be an adaption? a. a mouse digs a hole to hide from predators. b. a snake bites its prey to deliver it deadly venom. c.a jackrabbit has large ears that it release body heat. d.a parrot learns to say its owner's name.

Which is a result of the emission from the use of fossil fuel

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.