14. In 1914 the Passenger Pigeon ceased to exist. Hunting and habitat loss caused this extinction. Recently

scientists have tried putting Passenger Pigeon DNA from preserved specimens of the birds into unfertilized eggs

of their close relatives, Fantail Pigeons, creating a pigeon hybrid. This is an example of one technology used for:

a. Adaptive radiation

C. Declassification

b. Cretaceous extinction

d. De-extinction

De-extinction is an example of one technology used in the creation of pigeon hybrid.

Explanation:

The process of resurrection in biology of extinct species is called de-extinction.

In this process the organism is generated from the preserved cells of extinct species.

In this example, the DNA of the extinct species is inserted into the egg of the existing species. The unfertilized egg is injected with nucleus of the extinct species and the resultant egg is placed in the host mother cell.

One of the process of de-extinction is done by back breeding.

The species should not be extinct for longer time as the DNA is required in the process of de-extinction.

De-extinction is required to increase the number of endangered species and extinct species.