Dharma

In Hinduism, in addition to the concept of karma, there is also dharma and samsara. Dharma is a duty, sansara is a rebirth. Why would we not introduce the concept of dharma (how much will your karma on Habré change) and sansara (the moment it changes)? That is, karma falls during prolonged silence. It is necessary to explain why - every day, regardless of the circumstances, the dharma decreases linearly by so many. I wrote something - dharma has grown on a miser. Sansara has come - karma develops with dharma, resulting in a new karma.