Cognitive psychologists believe that cognitive processes must be studied in order to understand human behavior fully

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True

Explanation:

Cognitive processes are the processes that characterize the acquisition, organization and use of knowledge. In this sense, there are several processes that allow the individual to grasp the world, as well as the explanation of human behavior, such as attention, perception, representation and memory, language, reasoning and decision making. For this reason, cognitive psychologists believe that cognitive processes must be studied to understand human behavior.

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.