Certain organisms, such as slime molds, can form large plasmodia that contain multiple nuclei without membranes separating the nuclei and cytoplasm into distinct cells. Other organisms, like certain flatworms, have tissues that are syncytial that contain multiple nuclei enclosed within one plasma membrane. These organisms can reproduce, interact with their environments, consume nutrients and produce wastes. Based on the tenant of the cell theory that, "all organisms are composed of at least one cell", then:

Based on the tenant of the cell theory that, "all organisms are composed of at least one cell", then slime molds and flatworms support that theory because they are made up of cells, even though some are multinucleate.

Explanation:

The cell theory, first developed in 1838 by Matthias Jakob Schleiden and Theodor Schwann, indicates that all organisms are composed of one or more cells, since the vital processes of the organism are performed within cells, or by cells. Based on this, we can state that flat molds and worms support this theory, since they are considered living beings and have cells, in other words, flat molds and worms support this theory because they are composed of cells, although some are multinucleated.