Much like human skin, a plant has a tissue system which consists of a group of cells that work together for a very specific function and forms the first line of defense against physical damage and disease
This tissue system is called the dermal tissue system, and it is the plant's outer protective coating
The dermal system itself consists of a layer of tightly packed cells called the epidermis
Epidermis regulates exchange of gases and and acts as a protective barrier against any injury or infection
The epidermis in turn is covered with a waxy coating called the cuticle, which helps prevent water loss through the epidermis
some traits become more common, others less. ... The traits that become more common are the ones that are “adaptive” or “increase fitness” (that is, a creature's chances of living longer and producing more offspring).