Final Answer:
During embryonic development, humans share features with tunicates or lancelets, including gills and pharyngeal slits, highlighting evolutionary connections in chordate development. These structures represent common ancestry and early developmental similarities. so correct option is B
Step-by-step explanation:
During embryonic development, humans exhibit evolutionary conserved features with tunicates (sea squirts) and lancelets, both belonging to the phylum Chordata. The shared characteristics include gills and pharyngeal slits. In the early stages of human embryogenesis, the presence of gill arches and slits reflects our chordate ancestry.
While humans do not retain functional gills in adulthood, these structures are crucial for the respiratory and filter-feeding functions in tunicates and lancelets. The conservation of these embryonic features across chordates underscores a common evolutionary origin and the importance of understanding shared developmental pathways in elucidating the diversity and unity of life within the animal kingdom.
The transient presence of gills and pharyngeal slits in human embryos serves as a developmental link to our distant chordate relatives. So the correct option is B.