This is the answer key to the free at:
This worksheet was designed for an introductory bio class and includes instructions, questions, and a final VIDA chart. The student handout is included for convenience. To run the simulation, download it from PHET and host on your school's network.
A more difficult version of this assignment includes a CER and is more inquiry-based: https://www.biologycorner.com/worksheets/natural_selection_sim_phet.html