Lenin's most significant contribution to Marxist thought was the development of the idea that

Without a revolutionary theory, there can be no revolutionary movement

Explanation:

Lenin's most significant contribution to Marxist thought was the development of the idea that "Without a revolutionary theory, there can be no revolutionary movement."

This evident in the fact that it was the Lenin and the followers of his philosophy who used the idea to bring about the first successful communist revolution in Russia around 1917.

This eventually led to the creation of the first contemporary totalitarian state in the Soviet Union.

b. major john c. frémont led a rebellion called the bear flag revolt.

explanation:

during the bear flag revolt, from june to july 1846, a small group of american settlers in california rebelled against the mexican government and proclaimed california an independent republic. the republic was short-lived because soon after the bear flag was raised, the u.s. military began occupying california, which went on to join the union in 1850. the bear flag became the official state flag in 1911.

studies show tha in 7.5 billion years from now, the expanding sun will engulf, and destroy, the earth.