I believe that the answer is D. If something has evolved, it can not interbreed with its old species. I think this is right!
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Answer:
Arteries carry oxygenated blood away from the heart. Veins carry the blood back to the heart. Veins contain valves that ensure blood flows in only one direction. Arteries don’t require valves because pressure from the heart is so strong that blood is only able to flow in one direction.
Explanation: 
 
        
                    
             
        
        
        
Thinking is "Animistic"
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Answer:
This question is asking to identify the directional relationship between the following organs. They are explained below. 
Explanation:
1. The heart is MEDIAL to the lungs because it is located towards the middle in relation to the right and left lungs. 
2. The knee is DISTAL to the hip because it is farther away from the point of attachment of the hip joint.
3. The wrist is PROXIMAL to the hand because the wrist is closest to the point of origin of the hand.
4. The mouth is INFERIOR to the nose because it is lower in direction to the nose.
5. The thorax is SUPERIOR to the abdomen because it is located above the abdomen. 
6. The thumb is DISTAL to the ring finger because it is far away from the ring finger.
7. The sternum is ANTERIOR to the heart because it lies in front of the heart 
8. The skull is SUPERFICIAL to the scalp because it is close to the body surface. 
9. The ears are LATERAL to the nose because it is towards the middle line of the nose
10. Dorsal refers to the BACK of the human body, while ventral refers to the FRONT of the human body.
 
        
             
        
        
        
Hermit crabs and giant tritons have a commensalism type of relationship.