Definition: A flexible enclosing or separating tissue forming a plane or film and separating two environments (usually in a plant or animal).

Alright class, settle down now, let’s take a look today, At a word that’s quite important, in a scientific way! We're talking about “membrane,” a term you need to know, It’s more than just a covering, putting on a show. The dictionary tells us, with a helpful little plea: “A flexible enclosing or separating tissue, you see!” Think of it like this, my dears, let's make it clear and bright, Like a bubble around a cell – shining with light! It’s a barrier, a wall, if you will, that's true, Protecting what's inside, for me and for you. In plants and in animals, this layer does reside, Separating two spaces, where secrets hide. One environment from another, it keeps them apart, A crucial component, a vital work of art! So “membrane” means protection, a boundary so neat, Keeping things contained, oh so sweet! Do you have any questions? Let’s discuss and explore, This important concept, wanting to soar!