What is the cycling of nutrients between the ground and living organisms?

a) when nutrients from the ground are taken by living organism and returned when those organisms die and decompose.
b) when fertilizer is added to the soil by humans.
c) when planted deplete the soil of all its nutrients and can no longer grow there.
d) when limited numbers of living organisms are available to weather rock and contribute organic matter.

In the united states there are strict fishing seasons and limits, but not all countries enforce similar laws. in bangladesh there are few if any fishing restrictions. what might be the reason for less restrictions in smaller countries like bangladesh? a) the united states is the only country worried about overfishing. b) the united states wants to limit the supply of fish to increase the price. c) bangladesh and smaller countries have an unlimited supply of fish in their coastal waters. d) small countries, such as bangladesh, are practicing subsistence fishing, taking only the fish needed to survive.

20 the main source of energy for our planet comes from the

Which type of neuron stimulates muscles to contract?