Im pretty sire the answer in inflammation, so A.
Uneven heating of the Earth
Monomers are building blocks of the four basic macromolecules of life-monosaccharides are the monomers of carbohydrates, amino acids are the monomers of protein, glycerol/ fatty acids are the monomers of lipids and nucleotides are the monomers of DNA.
Answer:
The answer is rough endoplasmic reticulum.
Explanation:
If we apply this analogy to the cellular structures, the type of conveyor belt explained in the question represents the rough endoplasmic reticulum. Because it has a complex structure made up of membrane and ribosomes and it produces only a limited number of proteins just like the very efficient conveyor belt that produces only a few products.
I hope this answer helps.