Which event is most likely if an index fossil is found in a layer at location 1, but the layer and index fossil are not found at location 2 nearby, which is known to be the same relative age? The layer at location 2 is too old to contain fossils.
The locations were too close together.
The organism did not exist at location 2.
The layers at location 2 formed much earlier than those at location 1.

a sequence is a function whose domain is the set of natural numbers.

natural numbers are all the negative and positive integers

a chemical reaction happens

explanation:

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.