SAT Practice654af45e-67f9-45d0-a343-f3784da126af

Practice one SAT question at a time

Questions come from the Bluebook question bank. Made by Iskaa303 (Iskander Madikhan).

The familial structure of the black swan (Cygnus atratus) shows tremendous blank: 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.

Which choice completes the text with the most logical and precise word or phrase?