Final answer:
Bad science is marked by a lack of reproducible experiments, dismissal of mainstream science without evidence, and persistent failure to convince scientists possibly due to lack of evidence or rigor.
Step-by-step explanation:
The marks of bad science can be identified in various ways. One major indication of bad science is if the work is not based on experiments that can be reproduced by others, a core aspect of the scientific method. This ensures that findings are reliable and credible.
Another mark of bad science is when research speaks dismissively of mainstream science without presenting substantiated evidence or engaging in scientific debate. Lastly, simply being controversial or failing to immediately convince mainstream scientists does not necessarily indicate bad science, as groundbreaking research can be initially met with skepticism before it is widely accepted.
However, persistent failure to persuade scientists, particularly due to lack of empirical evidence or methodological rigor, might also be considered a sign of bad science.