Which compound contains both covalent and isotonic bonds? a) caco₂ b) co₂ c) h₂o d) nacl

C) H2O is the compound that contains both covalent & isotonic bonds.

*unless two atoms entering a chemical bond have identical electronegativity values
->the bond will always be somewhat polar
H2O has 2 negatively charge atoms (2 Hydrogen) in a chemical bond with -> 1 Oxygen(positively charged)

Iam pretty sure that the answer is d

Muscle fiber i think that i right