What is considered the most advanced animal phyla?
a. Chordata
b. Echinodermata
c. Mollusca
d. Arthropoda
ANS: A
Chordata is the most advanced phylum. The animals in this phylum have a rigid notochord, hallow
dorsal nerve system, and gill slits at some point in their development. Information can be found in the
section Construction of Complex Chordate Bodies Begins on a Stiffening Scaffold
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More freshwater fish are threatened with extinction than any other type of species.
Answer the following statement true (T) or false (F)
Which of the following statements is false?
a. In the process called speciation, one species splits into two or more different species. b. Geographic and reproductive isolation occur in sequence. c. Sooner or later all species become extinct. d. By definition, the fittest animals are the largest and strongest animals. e. Difference environmental conditions lead to different selective pressures.
Summarize the major differences between the Archean and Proterozoic. When did the Proterozoic begin and end? What will be an ideal response?
Which of the following reactions is involved in the activation of phosphatidylinositol secondary messengers?
A) dephosphorylation B) phosphorylation C) reduction D) oxidation