Explain how heterochrony may have been involved in the evolution of 1) pteropod gastropods, 2) the byssal threads of mussels 3) ascidians and larvaceans and 4) ascidians and vertebrates.

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

Imagine you come across an animal with a worm-like biody. Determine whether it is a polychaete or a member of class Hirudinida? Give two distinct differences between the two without naming the same structure/invisible features of each animal (e.g animal x has 2 wings, animal y has 4 wings are not distinct differences)

Describe the introvert of a loriciferan and a priapulid

Describe a reason for the hypothesis that the ancestor of eleuthero-zoan groups was a radial, sessile organism.

7. Define "heterochrony". Explain how heterochrony may have been involved in the evolution of (or transitions between) 1) pteropod gastropods, 2) the byssal threads of mussels, 3) ascidians and larvaceans and 4) between ascidians and vertebrates.