Microorganisms

A(n) _______________ is a living thing too small to be

seen with just your eye.

One of the smallest microorganisms is called ________________ .

It can be helpful or _______________ .

Bacteria can cause ______________, or they can help humans swallow and digest food.

Organisms called _________________ are larger than bacteria and can be found in lakes and ponds.

They have structures or parts that do special _______________.

A(n) _________________ is a protist that acts like an animal.

Its ________________ changes shape to catch food.

A(n) _________________ is a protist that carries out photosynthesis in the sunlight.

It also has a(n) _______________ , which helps it move to get food in the dark.