Final answer:
Niko prevents cross-contamination by cleaning and sanitizing her tools and washing salad greens and fruits.
Step-by-step explanation:
The two actions that Niko takes to prevent cross-contamination are:
1. Niko cleans and sanitizes the knife, cutting board, and work surface she used after cutting up raw beef, crayfish, and chicken together for the mains.
2. Niko washes salad greens and fruits in slightly warm running water before prepping them.