Food chain. Think of a food chain as a series of links side by side, and a food web as a large spider web connecting at multiple points.
Answer:
Parasitism
Explanation:
One organism benefits, and one is harmed.
The monomer of carbohydrates, monosaccharides.
Answer:
The meaningful differences between organisms in a population are genetic. Variations in the genome of members of a population arise through mutation. Occasionally, a mutation occurs in an individual that is beneficial, that helps that organism be better able to survive and repoduce in its current environment.