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

A. biotic community.

B. food web.

C. exchange pool.

D. reservoir.

Which energy transformation occurs in the core of a nuclear reactor? nuclear energy to mechanical energy nuclear energy to thermal energy thermal energy to nuclear energy mechanical energy to nuclear energy

The diagram below shows the reactants and products of a chemical reaction. What property of reactions does this diagram illustrate? Carbon + Oxygen arrow Carbon dioxide A. Energy is always produced in a synthesis reaction. B.

The velocity of sound in air at sea level is about 1100 ft/s. If a person hears a clap of thunder 4.00 s after seeing a lighning flash, how far is the lightning bolt?

The period of a wave is found to be 50 seconds. What is the frequency of the wave?

If it requires 4.0 J of work to stretch a particular spring by 2.0 cm from its equilibrium length, how much more work will be required to stretch it an additional 4.0 cm?

The malfunction indicator light in an OBD II system is flashing. Technician A says that this simply indicates a soft failure. Technician B says this means the problem could be damaging the catalytic converter. Who is right? A. Technician A only B.

What are some methods humans have used to control flooding and what has been done to worsen the effects of flooding?

Suppose an electron is moving with a constant velocity until it encounters a positively charged sphere on its right. How does the sphere alter the trajectory of the electron? a. It has no effect on the trajectory of the electron b.

Most of the mass of the Milky Way exists in the form of: a.) starsb.) gasc.) dustd.) dark matter

A 55kg cart is pushed by a force of 225 n. what is the carts acceleration?