Environment & Ecology · Biodegradable Substances
एक माली ने बगीचे में पांच अलग-अलग पदार्थ दबाए: केले के छिलके, समाचार पत्र, सूती कपड़ा, प्लास्टिक की बोतल और धातु का चम्मच। दफनाए गए पदार्थों में से कितने जैव-निम्नीकरणीय (biodegradable) हैं?
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