Q. Which of the following have become extinct fauna by this time?

1. Steller's sea cow
2. Tasmanian Tiger
3. Passenger Pigeon

Select the correct option from the codes given below:
Answer: 1, 2 & 3
Notes: Steller's sea cow (Hydrodamalis gigas), Tasmanian Tiger (Thylacine), and Passenger Pigeon (Ectopistes migratorius) are all extinct. Steller's sea cow became extinct in the 18th century, Tasmanian Tiger in the 20th century, and Passenger Pigeon in the early 1900s due to overhunting and habitat loss.