Vertebrate immune responses involve communication over short and long distances. Which of the following statements best helps explain how cell surface proteins, such as MHC proteins and T cell receptors, mediate cell communication over short distances?

Immune system

Explanation:

The immune system is the set of biological elements and processes within an organism that allows it to maintain homeostasis or internal balance against external aggressions, whether of a biological nature (pathogens) or physicochemical (such as pollutants or radiation) , and internal (for example, cancer cells). Recognizes the harmful and reacts to it (either external or internal aggression).

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the backbone of the dna and rna compound is sugar phosphate.