The smallest component of life among the options provided is tissue.
Here's a quick breakdown:
- Tissue: a group of cells that work together to perform a specific function.
- Organ: a structure made up of different types of tissues that work together to perform specific functions.
- System: a group of organs that work together to perform complex functions.
- Organism: an individual living entity made up of multiple systems.
So, tissue is the smallest unit among those listed.