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Classify the following:
Answer variants:
Compression
Mould
Preservation
Petrification
  
S. No
Fossils
Types
1. ammonite-2810722_1920.jpg
2.800px-Ellipsocephalus_hoffii_fossil_trilobite_(Jince_Formation,_Middle_Cambrian;_vicinity_of_Jince,_Stredocesky_Region,_Bohemia,_Czech_Republic)_(15076193917).jpg
3.450px-Culex_malariager_in_Dominican_amber.jpg
4.800px-Unidentified_fossil_turtle_-_Naturmuseum_Senckenberg_-_DSC02218.jpg