Afood handler uses the same spatula to place raw hamburgers on a grill and then remove cooked chicken breast from a frying pan is this correct

No, it is not correct to use same utensils for handling raw and the cooked food.

Cooking raw food an meat with the same utensil, can cause the transmission of meat particles on the hamburger. The hamburger is not cooked in a similar manner to the meat, so, the meat particles on the hamburger may remain uncooked, and may be they are contaminated with some pathogen, which can harm our body system. Hence, it is important to use different utensils for handling raw food and cooked food.

b. the carbon cycle ensures living things have a source of hydrogen