1.Are gender traits completely a result of societal expectations? 2.Are there any parts of the human body that get oxygen directly from the air and not from the blood?

3.Are there nuclear reactions going on in our bodies?

No. Gender traits in humans are largely determined by biophysical processes

Upper-layer skin cells and the cells in the front surface of the eyes get a significant amount of oxygen directly from the air rather than from the blood.

there are nuclear reactions constantly occurring in our bodies, but there are very few of them compared to the chemical reactions, and they do not affect our bodies much.  Chemical reactions do not change the nuclear structure of any atoms. In contrast, nuclear reactions involve the transformation of atomic nuclei.

Explanation:

Have great day

1- no

2- yes there are 2 parts of the body

- the cell in the front surface of the eye called the cornea

- the upper layer of skin layer

3- yes

Explanation:

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.