Five Kingdom Classification

Multicellular organisms, Saprophytic nutrition, Made of thread-like hyphae

Fungi are multicellular organisms made of thread-like hyphae. They do not have chlorophyll and obtain nutrition by decomposing dead organic matter (saprophytic). They are not autotrophic.

Amoeba, Paramecium, Euglena

Amoeba, Paramecium, and Euglena are unicellular eukaryotic organisms belonging to Kingdom Protista. Yeast and bread mold belong to Kingdom Fungi.

Body cavity

Flatworms are described as small, soft, flattened, unsegmented worms without a body cavity. They also have an alimentary canal with only one opening, the mouth. So the absent body cavity is the correct choice.

Have a backbone, Heart on ventral side, Nerve cord is dorsal, Usually have two pairs of limbs

Vertebrates have a backbone, heart on the ventral side, dorsal nerve cord, and usually two pairs of limbs. Invertebrates typically have three or more pairs of limbs when present.