Oh, this is a trick question! The thing is, the plant was <u>already 4 cm </u><u>on Day 0</u>. So from Day 0 - Day 15, the plant actually only grew (18 - 4 =) 14 cm.
They got you this time, but hopefully you know to watch out next time. I hope this helps!
Plants<span> respire all the time </span>because<span> their cells need the energy to stay alive, </span>but plants can<span> </span>only<span> photosynthesize when they are in the light</span>
