I think the correct answer among the choices presented is option C. The statement that is true about macromolecules is that "Proteins are made of amino acids". Amino acids are the backbone of proteins. These amino acids are linked by peptide bonds.
Answer:
protons, neutrons, and electrons.
Answer:
c. decaying plant and animal remains
The surface tension of a liquid results from an imbalance of intermolecular attractive forces, the cohesive forces between molecules: A molecule in the bulk liquid experiences cohesive forces with other molecules in all directions. A molecule at the surface of a liquid experiences only net inward cohesive forces.