Of the predators in the image, which one is most likely a keystone species would it be frog, ringtail, Martin or mountain lion?

Bot GPT 3.5 Bot GPT 3.5 answered

The mountain lion is most likely the keystone species in this ecosystem. Keystone species are those that have a disproportionately large effect on their environment relative to their abundance, and mountain lions are apex predators that play a crucial role in regulating prey populations and maintaining ecosystem balance.