If those are the optional answers, it's most likely sodium.
What are the questions that go with the model?
Answer:
They have a backbone, most use legs,wings,or fins for movement.
Herbaceous mano it has vascular bundles arranged in a ring around the pit and herbaceous dicot stems has a vascular cambium between xylem and phloem
Enzymes can be denatured by irregular PH. Meaning that they can change shape. Enzymes rely on their shape in order to function so if their shapes change because of the PH then the active sites don't fit anymore and they enzymes wont work.
