A. carbon uhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh duhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
B I think because it would have to be 25% so then Aa would be appropriate as of it's recessive.
A chemical reaction is a process in which one or more substances are changed into new substances.
An example of a chemical reaction is when metal rusts.