Answer:
- Roots grow down to anchor the plant to the seabed in order to fight the currents
- air sacs
- long strong back legs with extra joints, and a short backbone (spine) with a large hip bone
- beaks got smaller because the birds were able to eat the small, delicate seeds due to rainfall.
Step-by-step explanation:
I don't know if these are correct but here's my reasoning:
- compared to the other ones this was the best choice
- only one that had to do with respiratory system
- frogs need strong, back legs in order to jump easily
- during rainfall there would be more smaller seeds