Which lists three living units of the human body in order from the simplest to the most complex level of organization?

The list is cell, tissue and organ.

The basic structural and functional unit of the body is known as the cell.These are smallest unit of the body that performs all the vital functions of the body.

Tissues can be defined as the combination of cells that aims to perform the same function. Some examples are: connective tissue, epithelial tissues, et cetera.

Organs can be defined as the distinct structures present in the body such as heart, kidney, lungs,et cetera which is made of tissues and ultimately cells.

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

hope this   and an i get brainlsiest

did you fail the test? xd