Which of these elements is not likely to be found in an organic compound? A. carbon
B. hydrogen
C. nitrogen
D. potassium

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c. ozone layer hole d. increase in sea levels

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer

What is any method of measuring the age of an object or event in years, such as using atomic half-life?