what is Book gill and what is Book lung?
julietiwari161:
hii sister
Answers
Answered by
3
Answer:
It is believed that book lungs evolved from book gills. Although they have a similar book-like structure, book gills are external, while book lungs are internal. ... Book gills are flap-like appendages that effect gas exchange within water and seem to have their origin as modified legs.
Answered by
7
It is believed that book lungs evolved from book gills. Although they have a similar book-like structure, book gills are external, while book lungs are internal. ... Book gills are flap-like appendages that effect gas exchange within water and seem to have their origin as modified legs.
Similar questions