(a) Bacteria and Protists:
Bacteria: Prokaryotic, unicellular, lack a nucleus, and have peptidoglycan in their cell walls.
Protists: Eukaryotic, mostly unicellular, have a nucleus, and lack peptidoglycan.
(b) Fungi and Plants:
Fungi: Heterotrophic, absorb nutrients, have chitin in their cell walls, and lack chlorophyll.
Plants: Autotrophic, perform photosynthesis, have cellulose in their cell walls, and contain chlorophyll.
(c) Plants and Animals:
Plants: Autotrophic, have cell walls, chloroplasts, and can perform photosynthesis.
Animals: Heterotrophic, lack cell walls, and have a well-developed nervous system for movement.