21. How did the authors test the effects of artificial light on marine life?
A They exposed marine life to artificial light and
recorded how long they stayed awake.
B They exposed marine life to artificial light and
studied their numbers and behavior.
OC They exposed marine life to various colors of
artificial light and studied their numbers and
behavior.
OD They exposed marine life to various colors of
artificial light and recorded how long they stayed
awake.

Type the correct answer in the box. spell all words correctly. certain species of insects introduced accidentally in a forest are destroying all the douglas fir trees in that forest. the wood of these trees is extensively used for construction. in order to control the damage caused by these insects, the forestry department decided to introduce the moth caterpillar in the forest. these caterpillars are natural predators of the insects. which method did the forestry department implement to control the invasive species? the forestry department implemented a(n) control method.