Which of these is a supporting service - a service on which ecosystems
depend?
o
a. providing building materials
o
b. raising livestock
o
c. recycling nutrients
o
d. providing national parks

The correct option is C. Recycling nutrients

Explanation:

The nature benefits the humans in numerous ways. The benefits which the environment and all the natural ecosystems present have on humans is termed as ecosystem services. For example, the forest ecosystem is a natural ecosystem that benefits humans in numerous ways including the provision of wood for making houses etc.

Supporting services can be described as an ecosystem service by which essential components or services are continuously provided by the natural ecosystems to the humans. For example, recycling of nutrients.  

answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.