the bat and human are two very different species. kevin is trying to explain to his family how similar…

the bat and human are two very different species. kevin is trying to explain to his family how similar humans and bats really are. which statement would not be a good argument for common ancestry?\na they both have hair\nb the forelimbs of both animals have similar anatomy\nc they share similar dna structures of the hemoglobin protein\nd when comparing their embryos at the 1 week stage, they both have a tail and look strikingly similar

Answer

Brief Explanations:

To determine which statement is not a good argument for common ancestry between humans and bats, we analyze each option:

Option A: Having hair is a characteristic of mammals, and both humans and bats are mammals. However, hair alone is a relatively general mammalian trait and not as strong an indicator of common ancestry as more specific anatomical, genetic, or developmental similarities.
Option B: Similar forelimb anatomy (homologous structures) is a strong indicator of common ancestry, as it suggests evolutionary modification from a common ancestor.
Option C: Similar DNA structures for a protein (hemoglobin) indicate shared genetic heritage, supporting common ancestry.
Option D: Similar embryonic development (having a tail at an early stage) is a key piece of evidence for common ancestry, as it shows shared developmental pathways.

Among these, the statement about both having hair is the least specific and compelling argument for common ancestry compared to the others.

Answer:

A. they both have hair