A source from which organisms generally take elements is called a/an

A. exchange pool.

B. reservoir.

C. biotic community.

D. food web.

Suppose an automobile engine can produce 180 N*m of torque, and assume this car is suspended so that the wheels can turn freely. Each wheel acts like a 15.5 kg disk that has a 0.175 m radius. The tires act like 1.

Min is asked to balance the equation below. Original: Ca3P2 + H2O → Ca (OH) 2 + PH3 Min's result: Ca3P2 + H2O → Ca3 (OH) 2 + PH3 Which best describes Min's method for balancing the chemical equation? A.

A helicopter lifts a 66 kg astronaut 18 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/15.

When a 0.058 kg tennis ball is served, it accelerates from rest to a speed of 45.0 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 0.440 m. What is the magnitude of the net force acting on the ball? a.

Which of the following are energy solutions that release pollution into the air? coal petroleum fuel cells wind energy oil nuclear energy tidal energy

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?