The smallest unit of biological structure that meets the functional requirements of "living" is the _________

a. organ

b. organelle

c. cell

d. macromolecule

As a result, choices a, b, and d are erroneous.

All living beings have a basic biological, anatomical, and economic unit called the cell. These can self-replicate and are known as the emergence of life since they are the smallest basis of life. When observing cork tissue via a rudimentary lens, the scientist Robert Hooke noticed box-like structures and coined the term "cell."

iTissues are made up of several cells that work and function together. Organs are made up of several different tissues that join together to create them. Organs are thus not the smallest unit of life. Macromolecules are large molecules that emerge as a consequence of polymerization. Some cells, such as chloroplasts and mitochondria, have macromolecule aggregates that are surrounded by membranes. Organelles are the name for these structures.