Question

Humans often think of themselves as unique, but in reality there are only a few distinguishing features. Which of these is unique to humans as compared to other mammals?
a. Eccrine glands for thermoregulation
b. Red blood cells that lack nuclei
c. Messner's corpuscles for sensing pressure
d. A fully erect posture associated with bipedalism

Answer 1

Answer:

b. Red blood cells that lack nuclei

d. A fully erect posture associated with bipedalism

Explanation:

Eccrine glands can be found on horses, you may have seen horses sweeting. The pressure sensors can be found in other apes too. Fully erect posture is a characteristic of humans, other apes or monkeys may walk sometime like this, but their main locomotion is in 4 extremities. Non nucleated is a characteristic that gives an advantage because more oxygen can be carried  inside red blood cells making respiration more efficient.