Question

single - celled organisms are called unicellular. in multicellular organisms, cells are often specialized to perform specific functions. this is called the division of labor. specialized cells perform specific function that benefit the whole organism.

Explanation:

Single - celled organisms are known as unicellular. In multicellular organisms, cells become specialized to carry out specific tasks, which is the division of labor. Specialized cells perform functions that benefit the whole organism. The second blank has a misspelling (should be "specialized") and the third should be "division of labor".

Answer:

1. unicellular
2. specialized
3. division of labor
4. functions