Question

Current extinction rates for birds and mammals are ______ greater than the background extinction rate estimated from the fossil record.

Answer 1

100 extinctions per million species per year

Step-by-step explanation:

• The background extinction also knows as the standard rate of extinction in earth geology and biological history and these rates are used for the comparison and from the estimate rats of the species diversification and specialization of species the estimates are 100 or 1000 times higher than normal extinction.