Question

How are scientist able to determine that the majority of all organisms are now extinct?

Answer 1

We can learn information about extinct animals by examining fossil evidence and/or extant species that are closely related.

Answer 2

Explanation:

with the help of red data book ( book with list of endangered animals) every year the counting of spices are counted if there is decreasing amount of animal they add it to red data book they are called endangered (likely to be extinct) then when they doesn't get to see it completely they announce it as endangered is the answer of this question