Answer:
A. Unidirectional respiration, likely lived in large groups
B. hypothesized lifespans of roughly 100 years
D. carried their tails off of the ground
Explanation:
Saurapods are long neck hebivores with following characteristics :
- Unidirectional respiration
- Likely lived in large groups
- Very large
- Weak teeth
- Hypothesized lifespans of roughly 100 years
- Carried their tails off of the ground
- Extracervical vertebrae
- Reduced skull size
- Tooth to tooth occlusion for precise bites
- Four or more sacrals
- Reduced number of phalanges on manus.
Hence options A, B and D are correct.