a: Guard cells ~
b: little mouths
What:
"The guard cells are like little mouths, opening and closing according to how much sunlight there is and how much moisture is in the air"
Useful?
Writer: By Alvin Silverstein, Virginia B. Silverstein, Laura Silverstein Nunn
LCC:
Where:
Date: Nov 28 2015 6:08 PM
# 9282 Critique Analogy