Genes can be best described as

basic physical and functional unit of heredity.

Explanation:

Genes are made up of DNA. Some genes act as instructions to make molecules called proteins. However, many genes do not code for proteins.

answer;

c. a tree whose roots are surrounded by wet sand.

explanation;

water stress is an important factor limiting the growth and productivity of forests.water stress is the most often cited cause of poor survival and growth of woody landscape plants.

-insufficient soil moisture is the most common form of water stress, but excess moisture that leads to poor soil aeration (hypoxia) can also result in reduced plant vitality. a tree whose roots are surrounded by wet sand would be least likely to experience water stress.