Question

which species is most closely related to the extinct animal?
a species 1
b species 2
c species 3
d species 4

Explanation:

Step1: Compare DNA sequences

Compare the DNA sequence of the extinct animal (CTTGATGCCAT) with each species.

Step2: Count differences

• Species 1 (CATIATCCCGT): Many differences.
• Species 2 (CTTATACTGT): Some differences.
• Species 3 (CTTGAACTCAI): 1 - 2 differences (depending on exact alignment, assume minimal).
• Species 4 (CTTGCTGCCAT): 1 difference (A vs C at position 6).

Answer:

C. Species 3