Which of the following processes is responsible for the changes scientists observed in atmospheric concentrations of 12C, 13C and 14C?
A. the burning of fossil fuels
B. volcanism
C. the clearing of forests
D. chemical weathering
E. subduction
A
Biology & Microbiology
You might also like to view...
The condition of having no sperm in the semen is called ____________________. Fill in the blank(s) with the appropriate word(s)
Biology & Microbiology
A pyrimidine is double-ring molecule
__________________Indicate whether the statement is true or false.
Biology & Microbiology
The first plants to produce seeds evolved during the:a
Mesozoic era. b. Devonian period. c. Cenozoic era. d. Jurassic period. e. Cretaceous period.
Biology & Microbiology
If carbon has an atomic number of 6 and an atomic mass of 14, how many neutrons does it have?
A. 8 B. 7 C. 6 D. 14 E. There is not enough information to determine this.
Biology & Microbiology