Question

Check my answer, please? See below.

Answer 1

Seems good to me!
You can change that line [Water is SOMETIMES called] or add something like this:

Water is called the universal solvent because more substances dissolve in water than in any other chemical. This has to do with the polarity of each water molecule.!

Answer 2

Over all your answer is accurate!

Answer 3

@Ryaan

Answer 4

Question i need help with: living organisms are composed of millions of organic compounds, each having an unique structure. What element is responible for this huge diversity of molecules? Describe the diversity of structures that can be formed and the properties of this element that allow this diversity of form to occur

Answer 5

Your 2nd question:
Enzymes are important because we need enzymes in metabolism!
Almost all processes in a biological cell need enzymes in order to occur at significant rates.!

Your answer seems right!

For your another question It is Carbon ,you can read in detail here:
http://www.course-notes.org/Biology/Outlines/Chapter_4_Carbon_and_the_Molecular_Diversity_of_Life