What role does natural light exposure play in improving sleep at night?
a. it to regulate circadian rhythm.
b. it discourages napping during the day.
c. it a person absorb vitamins.
d. it prevents depression.

0% 10. use the table to answer the question. which elements would you expect to find mainly in the earth’s core? element density (g/cm3) aluminum 2.7 iron 7.87 nickel 8.9 silicon 2.33 iron and silicon aluminum and silicon aluminum and nickel iron and nickel