Question

What is the smallest level on the hierarchy of organization that is considered living?

Answer 1

Movement toward a stimulus is considered a positive response, while ... Describe the biological levelsof organization from the smallest to highest level ... to the entire biosphere, living organisms are part of a highly structured hierarchy.

Answer 2

The biological levels of organization of living things are arranged from the simplest to most complex. Here is a list.
organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.
So organelle would be the smallest.