A) in response to a crisis that wiped out the chondrichthyans. B) directly from lampreys and hagfish. C) early in the Cambrian period. D) directly from lancelets. E) the swim bladder from a lung.
Chordate pharyngeal slits appear to have functioned first as
A) the digestive system's opening. B) suspension-feeding devices. C) components of the jaw. D) gill slits for respiration. E) portions of the inner ear.
Arrange these taxonomic terms from most inclusive (most general)to least inclusive (most specific). 1)lobe-fins 2)amphibians 3)gnathostomes 4)osteichthyans 5)tetrapods
A) 4, 3, 1, 5, 2 B) 4, 3, 2, 5, 1 C) 4, 2, 3, 5, 1 D) 3, 4, 1, 5, 2 E) 3, 4, 5, 1, 2