What is meant by the term "cephalization"? Identify at least 4 animal phyla that possess this feature
What will be an ideal response?
Cephalization refers to the evolutionary tendency toward the formation of a head in which sensory organs are concentrated. This trend can be seen in bilateral animals from any of the phlya above the simple flat worms (except phylum Echinodermata; its members display pentamerous symmetry and lack cephalization).
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In the ABC model of floral determination, a different combination of the three genes specifies each floral organ. Which gene works in combination with the other two?
A. A B. B C. C D. florigen E. ethylene
DNA or protein can be used as a "molecular clock" that tells how long it has been since two species have diverged from a common ancestor.
Answer the following statement true (T) or false (F)
What term is used to describe a disease that develops slowly and is likely to continue or recur for long periods?
A) acute B) chronic C) latent D) subacute
Very rapid speciation occurred when cichlid fishes were isolated in Lake Victoria. Widespread extinction was dramatically seen when
A. hybridization stopped. B. insect larvae stocks were depleted. C. fishing was prohibited. D. predatory fish were added. E. artificial selection stopped.