Social psychology is: a. the study of processes of thought and knowledge

b. study of how behavior changes with age

c. the study of how an individual influences other people and how the group influences and individual

d. the study of how behavior depends on the outcomes of past behaviors and current motivations, principles of learning

i'm pretty sure the answer is a

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.

responsibilities im assuming

the answer to your question is,

old stone age.

-mabel < 3