What is the fundamental difference between baby back ribs and spare ribs?

The correct choice indicates that baby back ribs come from the upper part of the pig, specifically from the area near the loin where the ribs are shorter and more curved. This anatomical positioning gives baby back ribs their name, as they are situated along the spine and are generally more tender and lean compared to spare ribs.

Baby back ribs are smaller than spare ribs in terms of overall size and weight, which is a common misconception. They typically measure between 3 to 6 inches in length. Additionally, spare ribs come from the lower section of the pig, specifically the belly area, and are larger and meatier in comparison.

While smoking is a popular cooking method for spare ribs, it is not a defining characteristic that sets them apart from baby back ribs. Many methods of cooking can be applied to both types of ribs. Therefore, the key difference lies in their location on the pig and the resultant size and tenderness of the meat.