 This process of “going molecular” thus generally amounted to using experimental methods from molecular biology to examine complex phenomena (be it gene regulation, behavior, or evolution) at the molecular level. The molecularization of many fields introduced a range of issues of interest to philosophers. Inferences made about research on model organisms such as worms and flies raised questions about extrapolation (see  Section 3.3).  And the reductive techniques of molecular biology raised questions about whether scientific investigations should always strive to reduce to lower and lower levels (see  Section 3.1).