Help!!! From all my L.A folks...Mid-City/Fairfax/Pico-Roberson/Palms and Westside L.A back in the 1970's to 1980's (6 replies) Latest news from Fairfax, CA collected exclusively by city-data.com from local newspapers, TV, and radio stations. Ancestries: Irish (15.0%), Italian (12.2%), English (9.7%), German (8.4%), American (6.5%), European (5.0%).
Quick Answer. Multicellular organisms are composed of more than one cell, while unicellular organisms are a single living cell. This difference determines the size and complexity of an organism, as well as the division of labor within it. Each kind of organism has its own set of survival benefits.
Multicellular organisms need specialised organ systems, whereas all the life processes in a unicellular organism take place in that one cell. Multicellular organisms need organ systems to carry out functions such as:1  Communication between cells, eg the nervous system and circulatory system.2  Supplying the cells with nutrients, eg the digestive system. 3  Controlling exchanges with the environment, eg the respiratory system and excretory system.imple organisms may be unicellular, consisting of just one cell, while more complex organisms are multicellular. There are two types of cell division. Mitosis is used for growth and repair and produces diploid cells identical to each other and the parent cell.