Counting tree rings is an example of which type of dating?

How does the carbon cycle involve an exchange of carbon

Darwin’s hypothesis about how life changes over time is now called?

Mrna: gcuaauguc what amino acids does the mrna above code for? what type of amino acids or function are uag, uga, and uaa coding for? which codon (3 letters) signals translation to start and also codes for the amino acid methionine (met)?