The fossil record shows that for many plant and animal groups, the time between speciation events
A. is usually about 50,000 years.
B. varies greatly, but averages 6.5 million years.
C. is usually greater than 40 million years.
D. is equivalent to the length of one hundred generations of a species.
Answer:B
The fossil record shows that for many plant and animal groups, the time between speciation events
A. is usually about 50,000 years. B. varies greatly, but averages 6.5 million years. C. is usually greater than 40 million years. D. is equivalent to the length of one hundred generations of a species.