The same way as the rest of the dinosaurs.
Scientists believe the basilosaurus became extinct by when the water was getting too cold leading up to the ice agr
A basilosaurus is any of a group of very large extinct cetaceans of the family Basilosauridae, from the late Eocene period.
Basilosaurus is an extinct whale, so its habitat was either open ocean or coastal seas.
Aids...
Some possible predators of the basilosaurus were the shastasaurus, the dunkleosteus, and the elamosaurus. The basilosaurus was very large and had very few predators.
The list of extinct whales typically only includes those in the fossil record. However, the population of Atlantic Gray Whales went extinct in the 18th century. Extinct fossil whale species include the Durodon, Basilosaurus cetoides, and ambulocetus, The Obedenocetops is the closet to modern whales.
Basilosaurus lived during the Eocene epoch, approximately 40-34 million years ago.
They are not extinct.
They are not extinct.
They are not extinct.
The are not fully extinct but nearly extinct.
Most become extinct because they can not adapt to changes in their environments. Those that can don't become extinct.