| alternate |
to take turns (usually followed by "with"). |
| ancient |
very old; existing for many years. |
| comfortable |
feeling at ease. |
| gamble |
to bet money or other things on the way a game, race, or other event will end. |
| gene |
a tiny section of a chromosome. A gene causes a particular characteristic, such as eye color or hair color, to be passed on from parent to offspring. |
| hurl |
to throw with force. |
| melt |
to change from a solid to a liquid state through heat or pressure. |
| negligent |
not showing proper concern; careless. |
| punctuate |
to put commas, periods, apostrophes, and other such marks in a piece of writing. |
| pursuit |
the act of following or chasing. |
| research |
careful study of something in order to find out information about it. |
| responsibility |
something for which a person is responsible; duty. |
| revenge |
to get even for or pay back by causing injury or harm. |
| starter |
someone or something that starts. |
| startle |
to cause to move suddenly. |