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P1 gravity→cardiovascular system of terrestrial animals↓→举例snakes dwelling on land:evolve physiological strategies→mitigate these effects
P2 sea snakes:water negates gravity's influence→对比陆地的蛇和海里的蛇:陆地蛇有适应性
P3 陆地蛇的适应性:心脏离头更近→与sea snakes和arboreal snakes对比
1. E
2. A
3. D
定位P3 To aid blood return from the tail, arboreal snakes use muscular contractions during climbing to propel venous blood back to the heart.
4. A
定位P2 However, once sea snakes are removed from water and their bodies positioned with the head elevated, a marked decrease in blood pressure is observed, reaching a point where cerebral blood pressure drops to zero.
5. C |
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