Mythopoeia

Flora:

On the Human Earth, over time many of the native plants begin to become endangered with fewer pollination efforts being made for anything but food sources. The more time that passes, the more barren the earth becomes.

On the Animal Earth, Plants grow untainted as humans are no longer there to control their growth. The Divide also made way for plants like the Pink Lotus and the Wayaski plant that enhance animals sentience and state of mind similar to drugs that had been originally found on the Human earth.

Fauna:

On the Human Earth, animals have completely disappeared except for those that in time to find their way over to the other side.

On the Animal Earth, the animals initially were located where their ancestors always have, but with their newfound sentience and intelligence, animals like kangaroos and other such are not making their homes on different continents.

Conlag:

On Human Earth, Language remains the way it had been for years.

On Animal Earth, Animal Sentience allows them to quickly learn from books and other materials the languages that they had heard in their natural part of the world.