Run more trials for the experiment to ensure that the small difference is not significant. B
Answer:
The age of fossils are in millions.
Explanation:
These fossils were present on the earth millions of years ago due to different and unique structure of the fossil. The fossil is present in the bottom of the middle layer indicates that the more age of fossil i.e. millions of years according to the law of superposition. This law states that in an undisturbed layers of rocks, the top layer is the younger layer than middle and bottom layers which is older than the top layer, so we can say that fossils from deeper layers are older than fossils from the top layers of rocks.
Well, if it's an environmental community: Erosion changes the shape of the landscape. New plants grow in, small streams may form. New creatures moving in may also shape the community over time.
In a civilized community: New people in power, of course. Also, new people moving in and out. Hope I helped!
Whats the question? I think that you are missing a part of your question.