Convergent evolution means different origin but their function s r same...

Convergent evolution is the correct term to describe the kind of evolution in which two species of different genealogy come to resemble one another closely.

Explanation:
1. Convergent evolution:
Convergent evolution refers to the process in which unrelated species independently evolve similar traits or characteristics due to similar environmental conditions or ecological niches. It occurs when different species face similar selective pressures and develop similar adaptations to survive and thrive in their respective habitats.

2. Similarity in appearance:
When two species from different genealogical backgrounds adapt to similar environmental conditions, they may develop similar physical characteristics or morphological features. These similarities in appearance are not due to a common ancestor but rather a result of convergent evolution.

3. Example:
For instance, consider the evolution of wings in bats and birds. Bats are mammals and birds are reptiles. However, both bats and birds have evolved wings independently to enable them to fly. The wings of bats and birds have a similar function, but they have evolved from different ancestral structures. This is an example of convergent evolution, where two different species have independently evolved similar adaptations (wings) in response to the same selective pressure (ability to fly).

4. Adaptive radiation:
Convergent evolution can also occur during adaptive radiation when multiple species evolve similar traits to exploit different resources or niches within a particular habitat. An example of this is the development of similar body shapes and feeding structures in different species of Darwin's finches in the Galapagos Islands.

5. Distinction from other types of evolution:
a) Progressive evolution: Progressive evolution refers to the gradual accumulation of new traits or adaptations over time, leading to the development of more complex organisms. It is not specifically related to the convergence of species.
b) Parallel evolution: Parallel evolution occurs when two related species evolve similar traits due to shared ancestry and common selective pressures. It is different from convergent evolution, which involves unrelated species.
c) Retrogressive evolution: Retrogressive evolution refers to the loss or reduction of complex traits or adaptations over time, leading to simplified forms. It is not related to the convergence of species.

In conclusion, convergent evolution is the correct term to describe the process in which two species of different genealogy independently develop similar traits or characteristics in response to similar environmental conditions or ecological niches.