| bacteria |
microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. |
| ceiling |
the part of a room that is over your head. |
| follow |
to come or go after or behind. |
| guest |
a person who visits another person's home. |
| harm |
hurt or injury. |
| hike |
to take a long walk in a natural place, such as a woods or forest, for fun or exercise. |
| homework |
work that a teacher asks students to do at home. |
| messenger |
a person who carries and delivers messages and packages. |
| motorcycle |
a vehicle with two wheels, a heavy frame, and an engine. |
| pile |
a number of things on top of each other, or a mass of material that forms a small hill. |
| quiet |
making little or no noise. |
| stir |
to mix liquids together or move a liquid in a circle using your hand or an object. |
| switch |
to change; shift. |
| twig |
a small branch of a tree or other plant. |
| water |
the clear liquid that is in rain and that fills up rivers, lakes, and oceans. |