Which pure substance can be classified as an element

A pure substance cannot be separated into 2 or more substances by physical means. Pure substances have one set of physical and chemical properties. The particles of a pure substance are alike no matter where they are found. There are two types of pure substances: elements and compounds.

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.