Final answer:
The phrase that best completes the flowchart for important Egyptian achievements is that they shipped grain all around the region, highlighting their significant role in the ancient world's economy.
Step-by-step explanation:
When considering important Egyptian achievements, it's clear that Egypt contributed significantly to the culture and economy of the ancient world. Among the options provided, the one that best completes the flowchart as the third important Egyptian achievement is that they shipped grain all around the region. Egypt was able to produce and export vast amounts of grain due to the fertility of the Nile Valley, which led to being the breadbasket of the ancient world. Their efficient bureaucracy and practice of tax collection ensured that agricultural production was maximized and well-distributed. This achievement showcases their economic prowess and the importance of Egyptian agriculture in the ancient world economy.