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.
Mesenchyme is a form of loose connective tissue that develops within an embryo. It consists of a ground substance, made up of proteins and water and being gelatinous in texture, that protects and supports the cells and reticular fibers within.d. The mesenchymal cells arise largely from the mesoderm as the embryo continues to differentiate. Mesenchyme is considered a form of reticular connective tissue because it contains reticular fibers, which are fibers made up of a certain type of collagen known as type III collagen.