When cutting a specimen with a scalpel, it is best to stabilize the specimen with

Forceps

Explanation:

Using forceps is best to stabilize the specimen, while cutting a specimen with scalpel. Scalpel, a small, sharp knife-like tool is used to cut/dissect the specimens and their organs. Forceps is a tweezer like tool used to grasp or hold or to pick up the tissue, organ or small items.

thermophiles, notice the prefix thermo.