If 12.2g of H2O2 reacts in an experiment and produces 1.22g of O2 what is the percent yield

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.