Which of earth’s systems was most affected by fossilized dinosaurs ?

According to this food web which of the following would be considered primary consumers

Error analysis: what might be the reason that some of your percentages didn't exactly match your predicted results? gametes aren't responsible for inheritance. mice don't have large litters, so the sample size was not large enough. the wrong type of mice were used.

What is any method of measuring the age of an object or event in years, such as using atomic half-life?