So... I have'nt done this since November, but hope this helps.
1. A
2. A or B (most likely A)
3.B
4.B
The first animal fossils would be most like the main body bones. I hope that helped
Https://www.google.com/search?q=why+do+hot+air+balloons+rise&oq=why+do+hot+&aqs=chrome.1.69i57j0l5.3...
hope that helps