Help a frustrated Biology student with this question?

[ricky r]

__________ are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bridges between molecules.

A.Ionic bonds

B.Covalent bonds

C.Polar covalent bonds

D.Hydrogen bonds

E.Anionic bonds

[LennyFoof]

D - hydrogen bonds. They form due to unequal charges on the molecule. Individually they are weak but collectively are very strong which is why they can form bridges.

[Mark S]

The answer is definitely hydrogen bonds.