Part 1: The assignment document contains a table with nine images. The images are examples of nine different Animal phyla:Porifera, Cnidaria, Nematoda, Arthropoda, Platyhelminthes, Annelida, Mollusca, Echinodermata, and Chordata.
Part 2: Answer the following questions as they relate to the nine phyla in the assignment table. (Porifera, Cnidaria, Nematoda, Athropoda, Platyhelminthes, Annelida, Mollusca, Echinodermata, and Chordata.)
- Which phyla lack organs? What type of symmetry do they have?
- List all of the phyla that show cephalization.
- Do all organisms on the table have 3 germ layers (endoderm, ectoderm, and mesoderm)? If not, which phyla have fewer than three germ layers?
- One phylum on the table has more species than all the others. State the name of this phylum, and provide several different examples of species found in this phylum.
- Fish do not all have the same skeletal structure. Describe the differences among fish skeletal structures from the most primitive to more advanced types of fish.
- Describe the three types of mammals based on how their young develop.
Couplet Number Statement Choices Classification 1 a. Symmetry is irregular (neither bilateral or radial); aquatic; body structure without tissues or organs Class Demospongiae b. Symmetry is radial or bilateral 2 2 a. Radial symmetry, lacks a well defined head 3 b. Bilateral symmetry (similar right and left body halves, anterior head end and posterior tail end) 6 3 a. No spines or arms present 4 b. Spines or arms present 5 4 a. Barrel-shaped body, short tentacles at one end surrounding mouth, adults attached to a substrate Class Anthozoa b. Saucer-shaped, transparent body with thin tentacles, free floating Class Scyphozoa 5 a. Five arms present, body surface knobby Class Asteroidea b. Many-spined animal, resembles a pincushion Class Echinoidea 6 a. Animal has no apparent skeleton, or may have an exoskeleton (hard outer covering), or may have a shell; invertebrate 7 b. Animal has internal skeleton; vertebrate 16 7 a. No hard outer covering, no exoskeleton, or no shell; worm-like 8 b. Hard outer covering, exoskeleton, or shell; not worm-like 11 8 a. Body is segmented Class Clitellata b. Body is not segmented 9 9 a. Body long and tubular Class Secernentea b. Body flattened 10 10 a. Free living, aquatic, ribbon-like, smooth Class Turbellaria b. Endoparasites (live inside host); may look segmented Class Cestoda 11 a. No jointed appendages 12 b. Jointed appendages 14 12 a. Soft body inside bivalve shell (hinged shell with 2 halves), no head Class Bivalvia b. Soft body, obvious head 13 13 a. May or may not have a shell; head with tentacles, small eye or eye spot Class Gastropoda b. Large head with tentacles and large eyes present Class Cephalopoda 14 a. Two pairs of antennae, large claws often present Class Crustacea b. One pair of antennae or none, no large claws 15 15 a. Four pairs of legs, no antennae or wings Class Arachnida b. Three pairs of legs, wings present Class Insecta 16 a. Fishlike,…
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