An animal without a vertebral column has an unprotected notochord.
Correct Answer:
Verified
Q73: Lampreys are endothermic.
Q74: Hagfishes have three-chambered hearts, which improve gas
Q75: Hagfishes lack jaws.
Q76: _are the mammals with the greatest number
Q77: During embryonic development, the tail in mammals
Q79: How do monotremes differ from other mammals?
A)
Q80: Cartilaginous fishes lack gills in their adult
Q81: The_ forms from embryonic and uterine tissues
Q82: All female mammals produce milk to feed
Q83: Marsupials are egg-laying mammals.
Unlock this Answer For Free Now!
View this answer and more for free by performing one of the following actions
Scan the QR code to install the App and get 2 free unlocks
Unlock quizzes for free by uploading documents