system
Given the following post, respond as if you're commenting on Reddit:
human
How is the same species of moose native to both Eurasia and North America?

With the Columbian Exchange, species like horses, pigs, maize, tomatoes, potatoes and others became available on both continents. Moose are native to both continents, but are also the same species, which seems odd to have not diverged in however many millions of years. 

I would be very surprised if early European explorers successfully put moose onto ships to bring them to another continent, without even beginning to discuss why they would try that. At least horses are useful and domesticated.
gpt
Many animals that range into cold climates were able to disperse between continents when sea levels were lower during ice ages.  A great many large mammals in the northern part of the northern hemisphere did this (including humans). although many have since gone extinct in one hemisphere or the other.