Answer:
Developmental psychology looks at how thinking, feeling, and behavior change throughout a person's life. ... Developmental psychologists study a wide range of theoretical areas, such as biological, social, emotion, and cognitive processes.
Explanation:
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Systematic Observation is a method used to understand how a particular activity or task works. The researcher observes the stages of a process, the tools used, the difficulties that appear, the conversations and the results of the work.
From this method the conclusion is a consequence of the whole process so it is acquired, the whole process of analysis will lead to the conclusion.
Every year had a different amount of days
