The answer is: Eight grade
many scenes in famous literature such as Shakespeare contain actions, or themes that considered to be inappropriate if consumed by immature audiences. Eight grade is considered to be in the bare minimum since it's the time that students start undergoing puberty and able to understand mature themes.
hy·pox·e·mi·a
/ˌhīpäkˈsēmēə/
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noun
MEDICINE
an abnormally low concentration of oxygen in the blood.
ECOLOGY
oxygen deficiency in a biotic environment.
1. Protects human health and environmental safety
2.sets and monitors food packaging and labeling
3. Regulates policies for agriculture and forestry