How do the Upanishads challenge the caste system?

Historically, the most important of the Upanishads are the two oldest, ... Challenges to Brahmanism (6th–2nd century bce) ... The Atharvaveda describes another class of religious adepts, or specialists, the vratyas, particularly ... hierophant (one who manifested the holy) who remained outside the system of Vedic religion.

Explanation:

answer; (cognitive   dissonance);

question 1:

senate and house of representatives

i would try to answer the second question but i’m not 100% positive but i hope i