In examining an unknown animal species during its embryonic development, how can you be sure what you are looking at is a protostome & not a deuterostome?
Answer: you see a mouth, but not an anus.
In examining an unknown animal species during its embryonic development, how can you be sure what you are looking at is a protostome & not a deuterostome?
Answer: you see a mouth, but not an anus.