Unit 5 Biology Q&a

Unit 5 Biology Q&A

Thomas L Utsey

American Intercontinental University

Unit 5 Biology Q &A

1. Which phyla lack organs? What type of symmetry do they have? Poriferans, assymetrical

The poriferans are one phyla listed on the chart for our assignment that has no organs. The poriferan is neither bilateral nor radial, but it is asymmetrical.

2.     List all of the phyla that show cephalization? All of the phyla except Poriferans

The phyla cnidaria , mollusca , annelida , anthropods, echinodermata, chordate, platyhelminthes, and nematoda all show cephalization. The only phylus on the assignment chart that does not show cephalization is the poriferans.

3.     Do all organisms on the table have 3 germ layers (endoderm, ectoderm and mesoderm)? If not, which Phyla have fewer than three germ layers? The poriferans and cnidaria both have less than three germ levels.

4.     One phylum has more species than all the others. State the name of this phylum and provide several different examples of species found in this phylum.

The anthropods are the most prominent for number of species on the chart. Some examples of anthropods are butterflies, spiders, crickets, shrimp, lobsters and scorpions.

5.     Fish do not all have the same skeletal structure. Describe the differences among fish from the most primitive to more advanced types of fish.

Fishes have various vertebral bone columns . The vertebral bones of fish range from the primitive to complex. Different vertebral columns include the most primitive notochord , the cartilaginous vertebral column of the chondrichthyes and the of osteichthyes . Additionally, fishes have different skull types. The classification for the three are the jawless fish , cartilaginous fish and bony fish. Fish also have 2 different skeleton types they are chondrichthyes and osteichthyes.

6.     Describe the three types of mammals based on how their young develop?

The three types of mammals are...