It is The shoot and the root systems
D chemistry because that is what you need
They are sandwiched between two layers of heads. Recall that the heads are hydrophilic therefore they will always be on the outside and the tails are hydrophobi therefore they willl always be away from water, there fore sandwiched. I'm a bio major, hope I helped :)
Answer:
she will need 9/4 or 2 and 1/4
Explanation:
if you have 3/4 and you multiply it by 3 you get 9/4 so just forget the bottom number and just multiply the top number and then see how many of the top number fit into the bottom.
I think its carbondioxide