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.
Mesophyll Cells No, it's not a Mess of Phils. It's a mesophyll. The chloroplasts, where photosynthesis occurs, are in the mesophyll cells. There are two kinds of mesophyll cells in our typical leaf.esophyll Cells No, it's not a Mess of Phils. It's a mesophyll. The chloroplasts, where photosynthesis occurs, are in the mesophyll cells. There are two kinds of mesophyll cells in our typical leaf.