Final answer:
Sauropods had a unique, weight-bearing structure in their front feet, with elongated metacarpals and phalanges arranged in a vertical column.
Step-by-step explanation:
The unique, weight-bearing structure of sauropods' front feet
Sauropods were a group of herbivorous dinosaurs known for their large size, long necks, and long tails. In terms of their front feet, sauropods had a pillar-like structure that supported their massive weight. The main weight-bearing bones in the front feet of sauropods were the metacarpals and phalanges, which are equivalent to the bones in our hands and fingers. These bones were elongated and arranged in a vertical column, allowing sauropods to walk on all fours and distribute their weight evenly.