Title: Assignment: LAB - Animals (pt1)
Course: BIO-182 RTZ

COCONINO COMMUNITY COLLEGE

Bio182 - ANIMALS

In the Kingdom Animalia, all taxa are eukaryotic and lack cell walls. They are multicellular and heterotrophic. Evolutionary relationships have been examined using fossil evidence, anatomy, developmental patterns and genetics.

Phylogenetically, the relationship between animals is based on the following anatomical and developmental traits: the presence or absence of true tissues, type of body symmetry, presence or absence of body cavity (a coelom) and pattern of coelom development (acoelomate, pseudocoelomate, or true coelomate), and genetic information.

[Necessary lab documents must be obtained from publisher or created]

Answer the following questions through Canvas for 5 points:

1. Why are sponges considered an evolutionary dead end? Cite your source. (1 pt)

2.  In Chapter 31 (textbook), the authors list several traits shared by all animals. These traits form the basis for the idea that all animals are descendants of a single common ancestral lineage. List the traits and discuss which of these, in your opinion, provides the most compelling evidence that animals are monophyletic.  (2 pts)

3. Why is bilateral symmetry strongly associated with cephalization?  (1 pt)

4.  Describe how the tapeworm is adapted for parasitism.  (1 pt)

3.