Here's why:

* Desmosomes are cell junctions that provide strong adhesion between cells, acting like "spot welds" to hold them together.

* Plants have cell walls that provide structural support and act as a barrier between cells. They don't need the same type of cell-to-cell adhesion that animals do.

* Plants have plasmodesmata instead of desmosomes. Plasmodesmata are channels that connect the cytoplasm of adjacent plant cells, allowing for the exchange of molecules and communication.

So, while both plants and animals have structures that connect cells, these structures are different in each kingdom due to their distinct biological needs.