In american culture, good eye contact enables the sender to see if the receiver ispaying attention

Good eye contact enables the message sender to see whether a receiver is paying attention, showing respect, responding favorably, or feeling distress. Good eye contact reveals the speaker's sincerity, confidence, and truthfulness. The expression on a person's face can be almost as revealing of emotion as the eyes.

Explanation:

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.