Final answer:
Multicellular organisms have the advantage of having specialized cells that provide structural support (Option 4) and improve function efficiency. Their disadvantage is the increased energy requirement to maintain their complex systems (Option 2).
Step-by-step explanation:
The advantage of multicellular organisms based on the choices provided is that cells are able to provide support. In multicellular organisms, cells become specialized to perform specific tasks more efficiently, creating complex tissues and organs that work together to sustain the life of the organism. For example, circulatory systems manage the transport of nutrients and removal of waste, while respiratory systems regulate the intake of oxygen and expulsion of carbon dioxide.
The disadvantage of multicellular organisms is that they need large amounts of energy. The larger size and complexity of multicellular organisms mean that they need more energy to maintain their internal environment, grow, and perform vital functions. In comparison to single-celled organisms, this can be a significant challenge, particularly in environments where resources may be limited.