There are different kinds of muscles in the human body Each muscle is formed from a group of cells that work together the main function of a group of muscle cells is to Make oxygen
Release energy
Digest nutrients
Cause movement

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.

i believe that it is a exoplanet