what is a gene?
a. the basic unit of a nucleic acid, made of a phosphate, sugar ring,
and nucleotide base
b. the segment of a dna chain that codes for all or part of a trait
c. a double-stranded molecule that codes instructions for an
organism's physical characteristics
d. a physical or behavioral characteristic of an individual

D.

Explanation:

In biology, a gene is a sequence of nucleotides in DNA or RNA that codes for a molecule that has a function. 

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.