Jenny wanted to test whether worms prefer light or darkness best. after
researching the topic she came up with her hypothesis: if a worm is exposed to light
and darkness, then it will choose darkness over the light. the independent variable
in her experiment is the light/darkness.

true

false

Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. the winds blow from west to east in jet streams but the flow often shifts to the north and south. jet streams follow the boundaries between hot and cold air. the earth's rotation is responsible for the jet stream as well.