Chapter Questions
Choose the correct term from the following pair and then fill in the blank: Animals are defined as autotrophic/heterotrophic organisms, meaning that they can only obtain their nutrients by ___.
Based on the phylogenic tree from the beginning of the chapter, which animals are members of the clade that undergoes ecdysis (molting) during their life cycles?
Why don't flatworms need a circulatory system?
Based on the phylogenetic tree on page 304 , the phylum that includes ______ is the closest relative of our phylum, the ______.
True or False: Animals are classified as ONLY being multicellular (and NOT unicellular).
Which two special tissue types are unique to the animal phylum?
List two characteristics that define members of Phylum Cnidaria (jellies).
What is the most numerous phylum of animals, and why?