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

A. exchange pool.

B. reservoir.

C. biotic community.

D. food web.

The correct frequency of exercise in order for it to be effective is

Why are nylon ropes used in rock climbing? a. Nylon ropes are very stiff and therefore shorten the period of time over which a climber's fall is broken. c. There is no physical reason for the nylon material, it is just cheaper. b.

In physical science lab, Kim and Dawn added small pieces of magnesium to hydrochloric acid. They noticed that bubbles formed, the test tube got hot, and the magnesium disappeared.

A compressed spring has 16.2 J of elastic potential energy when it is compressed 0.30 m. What is the spring constant of the spring?

Is Switching drugs to OTC status generally increases costs for insured patients true or false

Why is it useful for pairs of DNA to be held together by men bonds and not covalent bonds?

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?