These are the only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart.
A. Mammals
B. Amphibians
C. Birds
D. Fishes
E. Reptiles
Answer: D
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A) It works through nuclear signals involving the lac operon. B) It works through direct cell-to-cell contact. C) It allows mRNAs to accumulate in the posterior portion of the Drosophila embryo. D) It provides symmetry to plant flowers. E) It directs mRNAs to antisense systems in the posterior portion of all organisms.
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