I say C. <span>it lowers the activation energy of a reaction in affects only very specific reactions. Correct me if I'm wrong tho...thank you ;)</span>
Answer:
systems, i.e. circulatory system
organism
Explanation:
Well, the snails probably can't live in water, so what they needed was oxygen.
well it's not A, not C and not D.
The answer is most likely B
Answer:
The cell was first discovered by Robert Hooke in 1665 using a microscope. The first cell theory is credited to the work of Theodor Schwann and Matthias Jakob Schleiden in the 1830s.