Since there are no choices to choose from, I'll just site all the structures of the leaf with its role then.
A Leaf has the following structures:
Cuticle
Upper epidermis layer
Palisade layer
Xylem
Phloem
Spongy mesophyll layer
Air space
Lower epidermis layer
Stomata
<span>Guard cells</span>
Hi!
The answer is "the heart"
Hope this helps!
-Payshence xoxo
“A mutation is a deform in a gene the throws off the form in an organism so the form in an organsim would be changed because of the deform.” -Answers.com
Hope this helped:)
Yes it is a requirement for liquids to do that