Question 8
For Numbers 7-10:
A number of species faced extinction during the Mesozoic era. Species R, S, T, U, V, W, and X were species that all became extinct during this era, and scientists have determined that their extinctions occurred based on the following constraints:
W became extinct before X. U became extinct after T.
S became extinct before T. X became extinct before U. V became extinct after U.
S became extinct before W.
R became extinct before S.
Which species could have been the fourth one to go extinct? [Hint: There is more than one answer]
Editorial note: List all possible species, in alphabetical order separated by commas, for example A, B, C.
A number of species faced extinction during the Mesozoic era. Species R, S, T, U, V, W, and X were species that all became extinct during this era, and scientists have determined that their extinctions occurred based on the following constraints:
W became extinct before X. U became extinct after T.
S became extinct before T. X became extinct before U. V became extinct after U.
S became extinct before W.
R became extinct before S.
Which species could have been the fourth one to go extinct? [Hint: There is more than one answer]
Editorial note: List all possible species, in alphabetical order separated by commas, for example A, B, C.