Final answer:
Unicellular and multicellular organisms share cellular structure, traits of life, and evolution.
Step-by-step explanation:
Unicellular organisms like bacteria and multicellular organisms like insects, birds, squirrels, and humans share several characteristics:
- Cellular structure: Both unicellular and multicellular organisms are made up of cells.
- Traits of life: They exhibit the characteristics of life, such as growth, reproduction, and response to the environment.
- Evolution: All organisms have evolved from a common ancestor.
These shared characteristics demonstrate the basic principles of life that apply to all living organisms.