In most ecosystems, the original source of energy for the living things in the system is
a. the sun
b. the primary producer
c. glucose
d. the heterotrophic

The correct answer is Sun

Explanation:

Note that the ORIGINAL (i.e natural and ultimate) source of energy is the sun. The sun's energy, called Solar energy is then trapped by a pigment in primary producers called Chlorophyll to produce sugars (glucose) through the process of PHOTOSYNTHESIS.

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.