Organisms must have variation within a population in order for natural selection to occur.

Which situation is an example of this variation?

What two characteristics do electromagnetic waves vary in?

The student throws one cannonball directly upward at 5.0 m/s and simultaneously throws the other cannonball directly downward at 5.0 m/s. (this requires great dexterity, but the student has been practicing this maneuver for several months.

Which of the following statements concerning coping strategies is not true? Individuals using one consistent strategy to cope with stress generally manage stress more effectively than others.

Which of the following best describes a spiral galaxy? Less than one hundred stars arranged in spherical shape A few thousand planets arranged in an elliptical shape Several billion stars arranged in arms spiraling outwards Several billion planets

A 5.7 g bullet is fired into a 1.5 kg ballistic pendulum. The bullet emerges from the block with a speed of 154 m/s, and the block rises to a maximum height of 11 cm. Find the initial speed of the bullet. The acceleration due to gravity is 9.8 m/s 2.

A. Which skill related fitness component is your strongest and weakest?

A 100 N box is placed on an inclined plane that makes a 30° angle with the horizontal. Calculate the component of gravitational force that acts down the inclined plane. A. 25 N B. 50 N C. 87 N D. 100 N

Approximately how many kelvins are equal to 60 c? a. 289k b. 323k c. 333k d. 413k

What are two ways to change velocity?

What is the main optical element of a refracting telescope?