- An elephant is a kind of animal species
- If the fossils of a species are different from the existing species, then the species has changed over time
- The fossil of the elephant in african savanna is different from the elephant species presently in that area
- So, the elephant in african savanna has changed over time

Hence, the elephant in african savanna has changed over time
Scientists found a fossil of an elephant in the African savanna. It has much longer tusks and is much larger than elephant species presently inhabiting the area. This elephant fossil most likely reveals
- An elephant is a kind of animal species 
- If the fossils of a species are different from the existing species, then the species has changed over time 
- The fossil of the elephant in african savanna is different from the elephant species presently in that area