Why doesn’t darken a cut apple with lemon juice?

If you spread a cut apple with lemon juice, the apple will start to darken several times slower, since the lemon juice will instead of the protective peel.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.