Answer:
What do you mean i'll help you but you need to be more specific
Explanation:
Hollow, that's why birds can fly. There is nothing in the bone to weigh them down.
The scientific method:
Observation
Problem
Hypothesis
Materials
Procedure
Data
Analysis
Conclusion
Nitrogen and oxygen make up about 99%of the atmosphere. I'm not sure if it will help! But thats all I know.
