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

A. biotic community.

B. food web.

C. exchange pool.

D. reservoir.

Is water flowing down hill stored energy

A lightbulb has a power of 100 W. and is used for 4 hours. A microwave has a power of 1200 W and is used for 5 minutes. a. How much energy is used by the lightbulb? b. How much energy is used by the microwave? c. The lightbulb has an efficiency of 1.

If element X has 99 protons, how many elctrons does it have?

What happens to the magnetic flux when it passes through a ferromagnetic substance?

A person driving her car at 48 km/h approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0 s before turning to red, and she is 30 m away from the near side of the intersection (Fig. 2-29).

World class speed skaters can skate a 3,000-m course in about 4 minutes. What is their average speed for this course? A. 12.5 m/s B. 1.33 m/s C. 1.25 m/s D. 13.3 m/s

A building that is 105.50 ft. feet tall is casting a shadow that is 37.50 ft. feet. If the building next to it, is casting a shadow of 41.00 ft. feet, how tall is that building?

What is the technical name for super glue type adhesives

On his fishing trip Justin takes the boat 25 km south. The fish aren't biting so he goes 10 km west. He follows a school of fish 15 km north. What distance did he cover? What was his displacement?

n open rectangular tank is filled to a depth of 2 m with water (density 1000 kg/m3). On top of the water there is a 1 m deep layer of gasoline (density 700 kg/m3). The width of the tank is 1 m (the direction perpendicular to the paper).