Specialized plant epidermal cells that lie on either side of stomata. these cells regulate the opening and closing of the stomata they surround and also regulate gas exchange and water loss in the plant tissue.

Dna. we have heard that we are a product of our dna. but where is it? how do we "get" our dna? it is passed to us, from our parents, but in what form? several vocabulary words associated with inheritance are used interchangeably and sometimes, incorrectly. let's see if you can clear this up for someone just learning about inheritance and cell structure.