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Observation is broken up into three parts. The first is the date. Then you have the activity and last you have a brief description of what is being observed.
Answer: Primary Sex characters
Explanation:
The primary sexual characters are associated with the growth of sexual organs such as uterus, vagina, penis and other reproductive organs in the human beings.
These organs are present in the body when the child is borne. This is because they grow when the child is inside the womb.
The development and maturation of these organs takes place during the later stages of life.
It is all of them. To be alive we all kind of have to have a face or body, we all need cells to help us with our day to day activities and we all need to communicate with other humans so that would be social behavior.