Exam 24: Animal Evolution: The Invertebrates

Classification. Respond to the following statements in reference to the five animal phyla listed below. -Members of this group have a brain with nerve cords,have a saclike or branched gut,and lack a circulatory system.

Four of the following are echinoderms.Which one is the exception?  

Classification. Respond to the following statements in reference to the five animal phyla listed below. -Members of this phylum have a brain with a ventral nerve cord,a complete gut,and a circulatory system that is usually closed.

-In the accompanying figure,a(n)____ has body plan B,which features a __________.  

What kind of system do annelids have in which blood flows through a continuous system of vessels?  

Animals most likely evolved from a colony similar to __________,a type of protist.

Figure 24.9 -In the accompanying figure,an asexually reproducing individual is indicated by _____.  

Which group of arthropods can be distinguished from other groups by their calcium-containing,hardened exoskeleton and mostly marine habitat?  

The ____ belongs to the same protostome clade as mollusks and annelids.  

What are commonly called sea slugs and are actually marine gastropods with a greatly reduced shell?  

In __________,the mouth forms from the second opening.

__________,such as jellyfishes,corals,and sea anemones,are radially symmetrical.

The animal gut cavity may be a fully lined coelom or a partially lined __________.

Four of the following describe a bilaterally symmetrical animal.Which one is the exception?