To solve this problem, we need to identify which polymer among the given options is biodegradable.$\newline$Biodegradable polymers are those that can be broken down by microorganisms into water, carbon dioxide, and biomass.$\newline$Let's analyze each option:$\newline$• Option 1: Nylon-6,6$\newline$ - Nylon-6,6 is a synthetic polymer made from hexamethylene diamine and adipic acid.$\newline$ - It is not biodegradable due to its strong amide linkages and crystalline structure.$\newline$• Option 2: Nylon 2-Nylon 6$\newline$ - Nylon 2-Nylon 6 is a copolymer made from glycine and amino caproic acid.$\newline$ - It is biodegradable because it contains peptide bonds similar to those in proteins, which can be broken down by enzymes.$\newline$• Option 3: Nylon-6$\newline$ - Nylon-6 is made from caprolactam and is not biodegradable.$\newline$ - It has strong amide linkages that resist microbial attack.$\newline$• Option 4: Buna-S$\newline$ - Buna-S is a synthetic rubber made from butadiene and styrene.$\newline$ - It is not biodegradable due to its stable hydrocarbon backbone.$\newline$Therefore, the correct answer is Option 2: Nylon 2-Nylon 6, which is a biodegradable polymer.