Question

question 20 2 pts water molecules have one oxygen atom that is more electronegative than the two hydrogen atoms bound to it. as a result, which type of bonding holds water molecules together? non - polar covalent bonding ionic bonding polar covalent bonding question 21 2 pts the \backbones\ of the macromolecules of life made of what element? carbon nitrogen oxygen

Explanation:

For Question 20, oxygen's higher electronegativity in water creates a polar - covalent bond as electrons are not shared equally between oxygen and hydrogen. For Question 21, carbon forms the backbone of macromolecules of life due to its ability to form four covalent bonds and create diverse, complex structures.

Answer:

Question 20: C. polar covalent bonding
Question 21: A. carbon