Question

what best shows the recent common origin of humans and chimpanzees?
a similarities in their dna sequences
b fossil record
c similar arm and hand bones

Explanation:

To determine the best evidence for the recent common origin of humans and chimpanzees, we analyze each option:

• Option a: DNA sequences are highly conserved and change slowly over time. The high similarity in DNA sequences between humans and chimpanzees (around 98 - 99% similar) is a strong molecular-level indicator of a recent common ancestor, as DNA provides a precise genetic record of relatedness.
• Option b: The fossil record can show evolutionary relationships, but it is often incomplete and interpreting fossils to show recent common ancestry between humans and chimpanzees is less direct and precise compared to DNA evidence.
• Option c: Similar arm and hand bones are examples of anatomical homology, which can indicate common ancestry, but anatomical features can be subject to convergent evolution or modification over time. DNA evidence is more reliable for showing recent common origin as it reflects the genetic blueprint passed down through generations.

Answer:

a. similarities in their DNA sequences