Scientists are unsure why this is (so)

It’s also true that larger dog breeds have shorter lifespans than their smaller counterparts. ** Scientists are still unclear as to why this is . Some believe that they age faster because of the strain their size puts on their bodies, and vets recommend geriatric check-ups on larger dogs at about seven years of age. Smaller dogs, by comparison, have geriatric check-ups starting at 10 or 11 years old.

Should there be a ‘so’ at the end of the following sentence? Scientists are still unclear as to why this is .

Thanks.

2 Likes

Yes, I agree with you.

However, you can also modify the sentence so as to avoid this confusion.

Scientists are still unclear as to why this happens.
Scientists are still unclear about this phenomenon.
Scientists are still unclear as to what causes this.
Scientists are still unclear about the reason for this.

3 Likes