holarctic realm in a sentence

1. Their distribution also makes up most of the Holarctic realm.
2. The West Estonian Archipelago is located in the southern part of the Phytogeographically, Estonia belongs to the Euro-Siberian region of the Holarctic realm.
3. Its historical distribution encompasses the vast majority of the Holarctic realm, though human activities such as development and active extermination have extirpated the species from much of this range.
4. It's difficult to find holarctic realm in a sentence.