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.

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

Which layer will become saturated first when rain falls?

The graph shows the amount of global warming happening in different ecosystems. which populations of organisms will likely decline the most as a result of climate change, and why? a.coral reefs because of the loss of the symbiotic algae living within their bodies b.penguin populations because the fish they eat will move into warmer waters c.mountain-dwelling birds because rising sea levels will relocate their food sources d.large cats in the rainforest because of decreased habitat loss for their prey