Why was the Yellow River important for ancient Chinese dynasties?

Without the protection provided by the river, dynasties were open to invasion.

Without the food grown in the river valley, dynasties could not remain in power.

Without the transportation provided by the river, dynasties could not reach the sea.

Without the large population in the river valley, dynasties were unable to raise armies.
HELP ASAP!

Alex is the head photographer for the yearbook and the newspaper. she has a large staff of assistant photographers because they need to take pictures at all of the school events. she knows that some of her photographers have better cameras and can take action shots at sporting events, and that some of them are good at taking candid pictures in the hallways. she sets firm deadlines so she has enough time to look through all of the shots and choose the best ones. she gives her photographers constructive feedback to them improve their pictures. respectful enforcer warlord doormat peacemaker