FOSSILS!!

4. / what part of the Earth System consists of all living things?
6. / which common sea creature depend on the habitat that an underwater reef provides
7. / which animal used to live on land, but today is now known as a sea creature?
9. / each ___ on a tree represents one year of it being alive
11. / which extinct creature is linked to the modern day "pill bug"?
13. / non- living
16. / which extinction happened about 65 million years ago and causes dinosaurs to go extinct?
19. / which type of fossil involves evidence of past life activity from an animal
20. / what is the bacteria that feeds on plant and animal tissue, even without oxygen
21. / which time period was 220- 270 million years ago?
22. / living
24. / which animal has rings that represent the age of it?
25. / smooth edges on a leaf would indicate ___ temperature

1. / which time period was 135- 180 million years ago?
2. / what is the geologic process when Earth's plates crash into each other?
3. / fossils are usually found in what kind of rock?
5. / ___ give lost of information about the animal or plant
8. / what was the largest extinction that caused 96% of all animals to go extinct?
10. / an archaeopteryx's ___ show that they're related to modern day birds
12. / what type of fossil is found in specific layers of rock all throughout the world?
14. / scientist believe that the earth is about 4.6 ___ years old
15. / ___ are older, while oceans are younger
17. / which type of fossil is formed when animals leave imprints of their bodies
18. / 90% of all ___ things that have been on earth are now gone
23. / jagged edges on a leaf would indicate ___ temperature