The VAERS website lists this caveat to their database: "A report to VAERS does not mean that the vaccine caused the adverse event, only that the adverse event occurred sometime after vaccination." What does this mean?

What are chlorofluorocarbons made of

Look at the following answer choices and determine which belongs in the both category. testable, can be disproven explains natural phenomena, has evidence to support it prediction, tentative, one or more scientists working together well established, many different scientists working independently, highly reliable

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection