Fossil records have allowed us to identify species like the western bison, an animal found throughout the area from Alaska to Minnesota before it became extinct around 3000 BCE. Current figures for the number of extinct species from this period, however, are likely to be underestimates, as most extinct animals are thought to be __________: many scientists believe there are hundreds of species from this time that we have not discovered.
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Verbal·Craft and Structure·Words in Context
easyWhich choice completes the text with the most logical and precise word or phrase?
A
applicable
B
controversial
C
unknown
D
interconnected