A similarity in both recrystallization and replacement modes of preservation is that delicate tissue and organs are not preserved. 
<h3>What are recrystallization and replacement modes of preservation?</h3>
Recrystallization is a mode of preservation of fossils in which the internal structure of the fossils is changed by addition of more minerals to form larger crystal of the same material. 
Replacement is a mode of preservation in which new material replaces the original material in the fossil. 
In both methods of preservation, delicate tissue and organs are not preserved. 
Therefore, a similarity in both recrystallization and replacement modes of preservation is that delicate tissue and organs are not preserved. 
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