The ratio of extinct species to living species on Earth is about:
a) 1 to 1000.
b) 1 to 100.
c) 100 to 1.
d) 1,000 to 1.
e) none of the above.
Answer: D
The ratio of extinct species to living species on Earth is about:
a) 1 to 1000.
b) 1 to 100.
c) 100 to 1.
d) 1,000 to 1.
e) none of the above.