Ask if you need further explanations

Yes, that's what I thought but the answer given is B.

Let me try better. I am sorry but on mobile is not easy during commuting

1. The passage provides information in support of which of the following assertions?

(A) The disadvantages of an adaptation to a particular feature of an environment often outweigh the advantages of such an adaptation.
Not okie

(B) An organism's reaction to being placed in an environment to which it is not well adapted can sometimes illustrate the problems that have been solved by the adaptations of organisms indigenous to that environment
okie

(C) The effectiveness of an organism's adaptation to a particular feature of its environment can only be evaluated by examining the effectiveness with which organisms of other species have adapted to a similar feature of a different environment.
Similar feature …. Not okie, other species – not okie

(D) Organisms of the same species that inhabit strikingly different environments will often adapt in remarkably similar ways to the few features of those environments that are common.
similar ways – not okie

(E) Different species of organisms living in the same environment will seldom adapt to features of that environment in the same way.
Different species – not okie

2. According to the passage, one reason that the distribution of blood in the sea snake changes little while the creature remains in the ocean is that

Because the vertical pressure gradients within the blood vessels are counteracted by similar pressure gradients in the surrounding water

(A) the heart of the sea snake tends to be located near the center of its body
Not okie
(B) pressure gradients in the water surrounding the sea snake counter the effects of vertical pressure gradients within its blood vessels
okie
(C) the sea snake assumes a vertical posture less frequently than do the terrestrial and the arboreal snake
not okie
(D) the sea snake often relies on waves of muscle contractions to help move blood from the torso to the head
not okie

(E) the force of pressure gradients in the water surrounding the sea snake exceeds that of vertical pressure gradients within its circulatory system
Not okie

3. It can be inferred from the passage that which of the following is true of species of terrestrial snakes that often need to assume a vertical posture?
Explanation:
One such adaptation is the closer proximity of the terrestrial snake's heart to its head, which helps to ensure circulation to the brain, regardless of the snake's orientation in space. The heart of sea snakes can be located near the middle of the body, a position that minimizes the work entailed in circulating blood to both extremities. In arboreal snakes, however, which dwell in trees and often assume a vertical posture, the average distance from the heart to the head can be as little as 15 percent of overall body length

(A) They are more likely to be susceptible to circulatory failure in vertical postures than are sea snakes.
Not okie
(B) Their hearts are less likely to be located at the midpoint of their bodies than is the case with sea snakes.
okie
(C) They cannot counteract the pooling of blood in lower regions of their bodies as effectively as sea snakes can.
Not okie
(D) The blood pressure at their midpoint decreases significantly when they are tilted with their heads up.
Not okie
(E) They are unable to rely on muscle contractions to move venous blood from the lower torso to the head.
Not okie

4. The author describes the behavior of the circulatory system of sea snakes when they are removed from the ocean (see lines 17-20) primarily in order to

(A) illustrate what would occur in the circulatory system of terrestrial snakes without adaptations that enable them to regulate their blood pressure in vertical orientations
okie
(B) explain why arboreal snakes in vertical orientations must rely on muscle contractions to restore blood pressure to the brain

(C) illustrate the effects of circulatory failure on the behavior of arboreal snakes

(D) illustrate the superiority of the circulatory system of the terrestrial snake to that of the sea snake
Not okie
(E) explain how changes in spatial orientation can adversely affect the circulatory system of snakes with hearts located in relatively close proximity to their heads
Not okie

5. It can be inferred from the passage that which of the following is a true statement about sea snakes?
Explanation:
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

(A) They frequently rely on waves of muscle contractions from the lower torso to the head to supplement the work of the heart.
Not okie
(B) They can not effectively regulate their blood pressure when placed in sea water and tilted at an angle with the head pointed downward.
Not okie ???
(C) They are more likely to have a heart located in close proximity to their heads than are arboreal snakes.
Not okie
(D) They become acutely vulnerable to the effects of gravitational pressure on their circulatory system when they are placed in a terrestrial environment.
okie
(E) Their cardiovascular system is not as complicated as that of arboreal snakes.
Not okie

6. The author suggests that which of the following is a disadvantage that results from the location of a snake's heart in close proximity to its head?

explanation: Such a locationrequires that blood circulated to the tail of the snake travel a greater distance back to the heart,

(A) A decrease in the efficiency with which the snake regulates the flow of blood to the brain
Not okie
(B) A decrease in the number of orientations in space that a snake can assume without loss of blood flow to the brain
Not okie
(C) A decrease in blood pressure at the snake's mid point when it is tilted at various angles with its head up
Not okie
(D) An increase in the tendency of blood to pool at the snake's head when the snake is tilted at various angles with its head down
Not okie
(E) An increase in the amount of effort required to distribute blood to and from the snake's tail
okie


7. The primary purpose of the third paragraph is to

(A) introduce a topic that is not discussed earlier in the passage
Not okie
(B) describe a more efficient method of achieving an effect discussed in the previous paragraph
okie
(C) draw a conclusion based on information elaborated in the previous paragraph
not okie, not conclusion
(D) discuss two specific examples of phenomena mentioned at the end of the previous paragraph
okie – choose – D is better than B
(E) introduce evidence that undermines a view reported earlier in the passage
not okie

8. In the passage,the author is primarily concerned with doing which of the following?

(A) Explaining adaptations that enable the terrestrial snake to cope with the effects of gravitational pressure on its circulatory system
okie
(B) Comparing the circulatory system of the sea snake with that of the terrestrial snake
Not okie
(C) Explaining why the circulatory system of the terrestrial snake is different from that of the sea snake
Not okie
(D) Pointing out features of the terrestrial snake's cardiovascular system that make it superior to that of the sea snake
Not okie, “explain the adaptation” is better
(E) Explaining how the sea snake is able to neutralize the effects of gravitational pressure on its circulatory system
Not enough information. wrong