I think it is the shortened way of saying it.
Answer:the correct verb is appears, the subjects are pigeons and building or science building
Explanation:Why I chose appears is because it makes more sense I don’t really know how to explain it. Why didn’t say several large pigeons together is because several large aren’t really subjects, they’re more like adjectives;describing. I don’t really know about the science building because well it might not be a subject because the pigeons are the main ones and I don’t know if it’s science building or just building because science basically tells what the building is. Hope that helps you.
I would say definitely use your time wisely. Make sure you are fully focused too. Though it may be difficult to focus, (I understand) try and find some outside resources that can help you bring interest into what you're learning in any subject.
1. the fastest
2. the slowest
3. 1 foot
4. the longest
5. 5mph slower
6. the highest
7. 18 years longer
8. 1 fph faster
9. The Zebra runs 9mph faster than the Giraffe.
10. A Pearl Mussel lives 50 years longer than a Lobster.