During DNA replication, what occurs? O The covalent bonds between sugar and phosphate molecules are broken.
O The hydrogen bonds between sugar and phosphate molecules are broken.
O The hydrogen bonds between pairs of nitrogenous bases are broken.
O The covalent bonds between pairs of nitrogenous bases are broken.

answer; both surfaces of the membrane are nonpermeable

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.