Reading Comprehension (RC) | Re: In terrestrial environments, gravity places special demands

I got the answer as D.


When removed from the water and tilted at various angles with the head up, however, blood pressure at their midpoint drops significantly, and at brain level falls to zero.That many terrestrial snakes in similar spatial orientations do not experience this kind of circulatory failure suggests that certain adaptations enable them to regulate blood pressure more effectively in those orientations .

In this it is inferred that terrestrial snakes have certain adaptations which