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  1. superfluous more than is needed, desired, or required
  2. robber frog of southwest United States and Mexico
  3. receptiveness willingness or readiness to receive
  4. perverse deviating from what is considered moral or right or proper
  5. retrovirus any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA); the virus transcribes its RNA into a cDNA provirus that is then incorporated into the host cell
  6. receptive aphasia aphasia characterized by fluent but meaningless speech and severe impairment of the ability understand spoken or written words
  7. soporiferous sleep inducing
  8. superficial of, affecting, or being on or near the surface
  9. respiratory pertaining to the act of breathing
  10. Rosa Parks United States civil rights leader who refused to give up her seat on a bus to a white man in Montgomery (Alabama) and so triggered the national Civil Rights movement (born in 1913)
  11. reciprocal concerning each of two or more persons or things
  12. paraphrase express the same message in different words
  13. respirator a breathing device for administering long-term artificial respiration
  14. supervisor one who has charge and direction of
  15. raspberry-red of the red of fresh raspberries
  16. reciprocal cross hybridization involving a pair of crosses that reverse the sexes associated with each genotype
  17. reciprocation alternating back-and-forth movement
  18. respiration a single complete act of breathing in and out
  19. Falco sparverius small North American falcon
  20. arborvirus a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis