What do we know about the influence of chemicals on aggression? High levels of testosterone may be related to aggression.
Low levels of testosterone may be related to aggression.
High levels of serotonin may be related to aggression.
The consumption of alcohol inhibits aggression.
Due to hormonal changes, men become more aggressive as they age.

not clear

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).