Likely the chronological age, mainly because it would explain the differences in puberty stages between the two boys, which is an example of physical maturation.
Drugs and supplements are similar in that both have an effect on the nervous system and that both are psychoactive substances. They are different in that drugs are often necessary to help someone overcome an illness, while supplements are optional and not necessary.
Answer: Also called a red blood cell (RBC).
Answer:Standing with hands above waist areac
Explanation:
