Question

Gravity collapses large organisms With the move onto land, the spine had to adapt to support limbs. It also had to resist bending in some places, while increasing mobility elsewhere. The following all relate to challenges related to coping with gravity.

The pectoral and pelvic girdle became larger and stronger in amphibians. List any two adaptations that allow pelvic and pectoral girdles to help resist gravity

Answer 1

The pelvic girdle underwent two adaptations to resist gravity: increased size and strength, and increased immobility.

Step-by-step explanation:

The pelvic and pectoral girdles underwent adaptations to help resist gravity when vertebrates moved onto land. Two adaptations of the pelvic girdle are:

1. Increased size and strength: The pelvic girdle became larger and stronger in order to support the weight of the body on land. This provided stability and helped resist bending caused by gravity.
2. Increased immobility: The bones of the pelvic girdle are strongly united to each other, forming a largely immobile, weight-bearing structure. This provides a strong foundation for the upper body as it rests on top of the mobile lower limbs.