A DID system can be used for fax and voice mail as well as for live voice connections. Compared to regular PBX service, DID saves the cost of a switchboard operator, calls go through faster, and callers feel they are calling a person rather than a company.
Key Concepts: In dicotyledonous leaves there are two types of mesophyll cells, palisade mesophyll and spongy mesophyll. Palisade mesophyll cells form a layer beneath the upper epidermis whereas spongy mesophyll cells are internal to the lower epidermis.
Connective tissue is the most common tissue in the human body. It is primarily used for structural support and protection. It covers a wide variety of uses. Blood, bone, lymph, and cartilage tissues are considered connective tissue.Muscle tissue is involved with the contraction of muscle fibers.here are four different types of human tissues: epithelial, connective, muscle, and nerve. They are each discussed below. Epithelial tissue is lining tissue. It composes the skin and linings of internal body cavities.