Question

The total species living today are how many times the species living in the past

Answer 1

More than 99 percent of all species that ever lived on Earth are estimated to be extinct. Estimates on the number of Earth's current species range from 2 million to 10¹², of which about 1.6 million have been databased thus far and over 80 percent have not yet been described.
Nearly several times more species exist today than species that existed in past.