Question

drag the words to complete the paragraph.
scientists use fossils to find out the age of . index fossils can be found in rock layers. they have three characteristics. first, they are easily . they have some distinguishing that make them easy for scientists to identify. second, they are found over a , such as an ocean or across a continent. this allows scientists to use these fossils to rock layers from different places. lastly, these fossils were of organisms that existed for a very time. when scientists find an index fossil, they can more accurately determine the of the rock layer.
wide area compare rock layers index limited recognized age sedimentary features

Explanation:

To solve this, we analyze each blank:

1. First blank: "index" (Scientists use index fossils...).
2. Second blank: "rock layers" (to find out the age of rock layers).
3. Third blank: "sedimentary" (Index fossils are in sedimentary rock layers).
4. Fourth blank: "recognized" (they are easily recognized).
5. Fifth blank: "features" (distinguishing features).
6. Sixth blank: "wide area" (found over a wide area).
7. Seventh blank: "compare" (use to compare rock layers).
8. Eighth blank: "limited" (existed for a very limited time).
9. Ninth blank: "age" (determine the age of the rock layer).

Answer:

1. index
2. rock layers
3. sedimentary
4. recognized
5. features
6. wide area
7. compare
8. limited
9. age