Explain why the offsrping with gg genes for pod color look the same as a pea plant with gg genes for pod color

This is more a biology question but anyway
 G = the dominant gene aka. the one that is most likely to be seen because it is stronger than g. GG and Gg will both show the dominant gene's characteristics.

 g = the recessive gene. The only way this one's type can be seen in gg form with no dominant gene to overpower it

Only one reactant yields 2 or more products. meaning you will only have 1 product and it will break down into 2 or more products. eg. h2o -> h2 + o2

B. a graduated substance