Explain why participants in the Pfizer-BioNTech vaccine trial recorded information in an app after receiving injections. No links plz

It helps doctors and scientists better understand the vaccine and it's effects on people, and it'll improve future variations of the vaccine.

Explanation:

We'll likely have to get more vaccines for the virus in the following years, so learning about the side effects it has on people and how likely it is for those to occur helps health officials adapt the vaccine to make it less likely for people to experience symptoms.

c- dynamic stretching

no, because those are both different running competitions. while distance runners train their legs and their lungs to run long amounts of time, the sprinters are training their legs and their lungs to give all they have in the little amount of area they need to cover. the brain also plays a huge part in all of this.

the brain is the only thing in your body that sends messages to your body telling you to run. if you are a long distance runner and you have the mind set of a sprinter, you will not get anywhere. if you have a long distance mind set and you have to run 200m in 20 seconds then you will not make it in time.