What is a description of something that includes a number and a unit is known as

Measurement. a quantitative description that includes both a number and a unit.

Explanation:

a single thing or person. any group of things or persons regarded as an entity: They formed a cohesive unit. one of the individuals or groups that together constitute a whole; one of the parts or elements into which a whole may be divided or analyzed.

the first settlements began along the huang river because of the importance of the huang river in the beginning of china. it goes back to the story, “the tale of emperor yu”, which references the tale of the great flood, which was caused by the huang river and was believed to create and influence china’s making.