The familial structure of the black swan (Cygnus atratus) shows tremendous __________ : breeding pairs with demonstrated success in rearing cygnets (young swans) have been observed to foster those of less successful pairs, and while rearing by female-male pairs is most common, male-male pairs sometimes rear cygnets too, achieving a significantly higher rate of survival to adulthood than female-male pairs.
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Verbal·Craft and Structure·Words in Context
hardWhich choice completes the text with the most logical and precise word or phrase?
A
elasticity
B
reciprocity
C
cohesion
D
affection