Way back in the ­­­­­­­­­­­­, there lived a man named Isaac Newton who really loved physics. A.
15th to 16th century

B.
17th to 18th century

C.
20th to 21st century

D.
1st to 2nd century

Mario was conducting research regarding the treatment of aids victims using stem cells. he found a source that was written recently and the author was known. unfortunately, he could not determine if it had been peer reviewed.

Wjat are substances intentionally added to food to produce a desired effect?

An _ exposure is a repeated or prolonged exposure(over months or years) that may bring about slowly developing symptoms.