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.
Report Abuse. Tissues are made up of cells. A tissue is a group of cells working together to perform similar functions. An example of a tissue would be the palisade mesophyll tissue in plants (http://www.arboretum.harvard.edu/researc...which is made up of palisade mesophyll cells.The function they perform together is photosynthesis.eport Abuse. Tissues are made up of cells. A tissue is a group of cells working together to perform similar functions. An example of a tissue would be the palisade mesophyll tissue in plants (http://www.arboretum.harvard.edu/researc... which is made up of palisade mesophyll cells.