In the following text, what does "the latter scenario could hardly seem more implausible" mean?
The result suggests one of two scenarios. One is that arctic foxes gave rise to swift foxes, an evolutionary sequence that would depend on the arctic fox being much older than the fossil record currently indicates. The second possibility is that swift foxes gave rise to arctic foxes, likely during the height of a period of glaciation when tundra forming to the south of the ice sheets may have met the grassland habitat of the swift fox. On the one hand, the latter scenario could hardly seem more implausible. Swift foxes, after all, live on the arid, sun-baked prairies and open desert, where temperatures can top 120°F (49°C). It's hard to imagine a greater environmental leap from this environment to the frozen tundra. To have acquired over the course of a few hundred thousand years all the adaptations necessary for survival in such an extreme environment suggests a rapid rate of evolution.
I think it means "highly likely or probable" but chatGpt say " highly unlikely or improbable"– ebrahimi May 21 '23 at 22:59