Excavations to allow the world's largest ships to pass through the canal have exposed geologic formations millions of years old, and provides researchers an opportunity to investigate ancient climate patterns.
A. old, and provides
B. old and given
C. old, providing for
D. old and has provided
E. old and gives
A. old, and provides
B. old and given
C. old, providing for
D. old and has provided
E. old and gives
