Where did the Jōmon people come from? Were they
the ancestors of modern Japanese?

southeast Asia , the Yayoi and Jomon

Explanation:

The Jomon originated in southeast Asia and spread to Japan about 12,000 years ago. The Jomon or the Yayoi were the true ancestors of the modern Japanese.

 Experts now conclude that the prehistoric Japanese people and ancestors of the Jomon people originated from somewhere around Lake Baikal area in Russia (currently called Buryatia which is known to have been inhabited as long ago as 23,000 years ago).

Explanation:

Hope this helps :)

c. troops marched forward in close formation against newer, more accurate weapons

the government closely monitored its finances to avoid another financial collapse.