The distinguishing animal trait "A," that separates the body forms of the eumetazoa and the parazoa is
A. whether the animal has bilateral symmetry and three germ layers, or radial symmetry and two germ layers.
B. whether it is the mouth or the anus which forms first from the opening in the developing embryo.
C. whether the animal must periodically molt in order to grow, or has characteristic soft larval stages.
D. None of the answer choices is correct.
E. whether or not the animal has true tissues.
E. whether or not the animal has true tissues.
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The environment in which a microbial population lives is its habitat
Indicate whether the statement is true or false.
Air pollution over a long period of time can cause this condition
A) malaria B) measles C) emphysema D) influenza
Oxidizing agents include all of the following EXCEPT
A) chlorine. B) glutaraldehyde. C) hydrogen peroxide. D) iodine. E) ozone.
What significant genetic function occurs in the S phase of the cell cycle?
A) karyokinesis B) centromere division C) chromosome condensation D) cytokinesis E) DNA synthesis