Answer:
Two members of the excavate clade that can cause disease are <u><em>diplomonads and parabasalids</em></u>
Explanation:
The excavate clade comprises of unicellular organisms which are eukaryotic. This group contains free-living organisms as well as organisms which form symbiotic relationships.
The diplomonads can be described as a group of flagellates which are considered to be parasitic. Some of them are even parasites to the humans.
The parabasalids are a group of flagellated protists within the supergroup Excavata. These organisms also form parasitic relationships.
"The mouth" is the correct answer
Its social behavior I do believe
