What is the unifying theme of all modern biology?

A) zoology
B) ecology
C) evolution
D) biochemistry


C

Physics & Space Science

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If the Moon is setting at 6 A.M., the phase of the Moon must be

A) first quarter. B) third quarter. C) full. D) new. E) waning crescent.

Physics & Space Science

In radioactive dating, carbon-14 is often used. This nucleus emits a single beta particle when it decays. When this happens, the resulting nucleus is

A) still carbon-14. B) boron-14. C) nitrogen-14. D) carbon-15. E) carbon-13.

Physics & Space Science

A segment of wire carries a current of 25 A along the x axis from x = -2.0 m to x = 0 and then along the y axis from y = 0 to y = 3.0 m. In this region of space, the magnetic field is equal to 40 mT in the positive z direction. What is the magnitude of the force on this segment of wire?

a. 2.0 N b. 5.0 N c. 1.0 N d. 3.6 N e. 3.0 N

Physics & Space Science

Riding down a river in an old canoe, if the discharge of the river increases a little and the width and the depth of the river stay the same, the speed of the river will

A) decrease. B) increase. C) stay the same. D) become unpredictable.

Physics & Space Science