Question

the reason for the red stuff. they think it helps the mushroom, but they are not sure how it does that. the red liquid shows up when the mushroom is young. the mushroom grows in this period of its life. after that time, the liquid goes away. the mushroom turns light brown. it is old. look at the meaning of \period\ in the chart. which clue helps you understand what \period\ means? word period clue ? meaning when something happens

Explanation:

The word "period" is explained by the context clue "time". In the sentence "The mushroom grows in this period of its life. After that time...", "time" is used as a synonym or equivalent to help understand what "period" means.

Answer:

The clue "time" helps understand what "period" means.