Which of these is most responsible for differences in the 20th century to the 21st century

i thinl it is the 1st answer

your stuuupid lolz

explanation:

freedom of speech is also protected by the 1 amendment.

explanation:

here is pretty much what the 1st amendment says:

congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.

a. theta waves. this is because the person is in a light sleep which means the brain waves would show these kind of waves.