a. Parthenium is an endemic species of our country.

b. African catfish is not a threat to indigenous catfishes.

c. Steller’s sea cow is an extinct animal.

d. Lantana is popularly known as carrot grass.

Answer: Steller’s sea cow is an extinct animal

Explanation: The Steller sea cow (Hydrodamalis gigas) is an endangered sirenian  discovered by Europeans in 1741. At the time, it was found only around the Commander Islands Islands in the Bering Sea between Alaska and Russia; its scope was very wide during the Pleistocene, and it is possible that the animal and humans participated earlier. Steller’s sea cow was named after Georg Wilhelm Steller, a naturalist who discovered the species in 1741. Within 27 years of being discovered by Europeans, this slow-moving and easily caught mammal became extinct because of its flesh, fat, and skin.