Here are the correct placements for each item:
Logos:
- black rhino populations declined by 96% between 1970 and 1995
- the remnants of rhino carcasses were scattered across the ground
Ethos:
- leading biologists from the University of Nairobi contend that protecting rhinos is critical to saving African ecosystems
Pathos: (There are no items listed that fit pathos in your provided examples.)
So, you would place:
- "leading biologists from the University of Nairobi contend that protecting rhinos is critical to saving African ecosystems" under Ethos.
- "black rhino populations declined by 96% between 1970 and 1995" and "the remnants of rhino carcasses were scattered across the ground" under Logos.