Final answer:
Factual statements include that Egyptian civilization developed along the Nile River, it is one of the oldest civilizations, and the fertile plains near the Nile promoted its growth. The claim about the bravest soldiers being Egyptian is subjective.
Step-by-step explanation:
The sentences that make factual statements about Egyptian civilization include: "Egyptian civilization developed along the banks of the Nile River." This statement is factual as the Nile River was indeed the cradle of Egyptian civilization, with its predictable flooding providing fertile soil for agriculture.
Another factual statement is: "Some historians believe that it is one of the oldest human civilizations." Egypt is considered one of the earliest and most enduring civilizations, known for its rich culture and monumental architecture.
Lastly, the statement, "The fertile plains near the Nile helped the civilization grow," is also factual because the nutrient-rich soil from the Nile's floods was conducive to farming, which supported the population and led to urbanization and cultural development.
The claim that "The bravest of all soldiers were from the Egyptian civilization" is a subjective statement and not a factual assertion that can be measured or universally verified.