Say something idiotic about this ​

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

56.16 gregor mendel was the first scientist to use statistics to analyze scientific data. before mendel's experiments, scientists believed that organisms acquired traits from their environment and passed them on to their offspring. after mendel's discoveries were accepted, scientists realized that traits passed to offspring were the result of genes being passed from parents to offspring. this is an example of pls

What is the value of keq for the reaction expressed in scientific notation?