Here's a sentence that describes a way multicellular and unicellular organisms are alike:

Both multicellular and unicellular organisms require a source of energy to survive and carry out life processes.

Here's why this is correct:

* Multicellular organisms (like plants, animals, and fungi) are made up of many cells working together.

* Unicellular organisms (like bacteria and amoebas) are made up of only one cell.

While they are structured very differently, both types of organisms need energy to perform basic functions like growth, reproduction, and maintaining their internal environment.