1 A day care is a business, and as a business owner you'll be in charge of employee management, bookkeeping, marketing, and other responsibilities that come with running a small business in addition to providing childcare.
Guard cells, chloroplast-containing cells scattered throughout the epidermal layers regulate the opening and closing of the stoma. Periderm tissue forms the outer bark of woody plants and will be discussed later. Observe the prepared slide of a leaf epidermis and compare with the micrograph below.
In young stems, which lack what is commonly called bark, the tissues are, from the outside to the inside: epidermis, periderm, cortex, primary phloem, secondary phloem, vascular cambium, secondary xylem, and primary xylem. As the stem ages and grows, changes occur that transform the surface of the stem into the bark.