Question

What is the smallest part of living matter?

Answer 1

The smallest unit of living matter is the cell.

Explanation:

Cell theory states:

All living organisms are composed of one or more cells.
The cell is the basic unit of structure and organization in organisms.
Cells arise from pre-existing cells.

For more info:
https://www.thoughtco.com/cell-theory-373300

Answer 2

I would say the cells.

Explanation:

The most basic units of life are cells, which are tiny organisms that are essential for any life to exist. Even the smallest life forms, bacteria, are itself are cells. The human body contains trillions and trillions of cells.

Each cell is specialized to perform different functions, and are adapted to those functions well. Red blood cells have a large surface area with no nucleus and are very thin, so that they can carry the most oxygen possible and oxygen can get in and out of the cell very easily.

Those are just the basics of cells. To read more about these fascinating units, visit:

https://ghr.nlm.nih.gov/primer/basics/cell