Question

Initially, the myrtle warbler and Audubon's warbler were considered two different species. These birds have now been reclassified as eastern and western forms of a single species. Which of the following pieces of evidence would warrant this reclassification?. . A.The two forms interbreed successfully where their habitats overlap.. . B.The two forms live in habitats with similar terrain and temperatures.. . C.The two forms eat the same type of wood grubs and flying insects.. . D.The two forms display very similar physical traits such as coloration and tail-shape.

Answer 1

The Myrtle Warbler and the Audubon's warbler used to be considered two separate species. However, pieces of evidence warrants a reclassification of Eastern and Western forms of a single species. The reason for the reclassification is the two forms interbreed successfully where their habitats overlap. The correct answer is A. 

Answer 2

Answer:

Option A, The two forms interbreed successfully where their habitats overlap

Explanation:

The two species of warbler i.e myrtle warbler and Audubon's warbler are capable enough to interbreed when their  habitat overlap by maintaining postzygotic selection against hybrids.

These two warblers do not interbreed freely but they do so on routine basis in a narrow zone  at the northern edge of the Audubon form’s range in western Canada to hybridize

Hence option A is correct