As human travel increases, the number of introduced species likely

Increase

Explanation:

As humans travel from one place to another there are chances that the number of introduced species will also increase.

This is possible because humans might carry some species of organism along with them intentionally or unintentionally that might introduce them to a new area.

Thus, there is a increase in the number of the introduced species due to increased human travel.

not sure if this is what you'r looking for eubacteria and archaebacteria