Some people believe that are messages that can be sent to consumers, prompting them to buy a product without their being aware of receiving such messages.

Subliminal messages.

Explanation:

A subliminal massage bypasses the concious mind, it goes directly to the subconscious level. They operate below the threshold of consciousness. It may be used in advertising or in marketing campaigns.

early settlements on the subcontinent. both the indus and the ganges rivers carried rich silt from the mountains to the plains. when the rivers flooded, the silt spread over the plains and made the soil in the river valleys fertile for farming.

answer; researchers typically cannot control people's sexual behaviors as would be necessary in an experiment;