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

A. exchange pool.

B. food web.

C. reservoir.

D. biotic community.

answered|Score. 8

A train travels 57 kilometers in 3 hours, and then 87 kilometers in 2 hours. What is its average speed? km/hr

How has God designed sound waves so that a person is able to hear all the different instruments in a musical piece at the same time?

The waves used by a microwave oven to cook food have a frequency of 2.45 gigahertz calculate the wavelength of this type of wave'

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If a space ship is traveling with a constant acceleration of 75 m/s^2 and travels for three weeks, how far did it travel and what was it's velocity before it stopped?