Describe the life cycle of freshwater eels. How does the life cycle of American eels differ from that of European eels?

Which of the following is the correct classification for this chordate animal: This vertebrate possesses hair and mammary glands.  They are endothermic.  This group gives birth to live young at a fetal stage.  Most then nurture their young in a pouch.   Question 31 options:   a)  Class Chondrichthyes   b)  Eutharia   c)  Cephalochordata   d)  Birds    e)  Urodela / Salamanders   f)  Class Osteichthyes   g)  Monotreme   h)  Reptiles (non avian)   i)  Anura / Frogs   j)  Superclass Agnatha   k)  Marsupial

Tabulate differences lancelet and lamprey with regard to their habits , external characters, muscles and skin?

How do ammocoetes and adult lamprey differ?