Question

according to iucn, currently known and described species of all organism are between
1. 17-18billion
2. 1.7-1.8 million
3. 5.7-5.8 million
4. 11.5-12 million​

Answer 1

The answer is:
2. 1.7-1.8 Million years

HOPE IT HELPS

Answer 2

According to iucn, currently known and described species of all organism are between 1.7-1.8 million.

1. the current count according to International Union for Conservation of Nature, (IUCN) the count is round 1.7-1.8 million were 61% of total species of insects.
2. Approximately every year 15,000 new species are discovered and are added to the count.
3. there are but 8.7 million species of plants and animals approximately that are in existence but are yet to be discovered .

hence, the correct option is 2. 1.7-1.8 million.