Prot/Proto

Protagonist

• the main character in a literary work

• Kamala Khan is the protagonist of the new Ms. Marvel comic.

Protocol

• a code of diplomatic or military rules of behavior

• The teacher broke classroom protocol by allowing students to jump around, eat food, listen to music and avoid class work.

Protoplasm

• the substance that makes up the living parts of cells

• We learned about protoplasm when we studied cells.

Prototype

• an original model on which something is patented

• The Volkswagen prototype was on display last month.

Protozoa

• one-celled animals

• My nerdy science brother thinks Protozoa are so cute.