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- 06:46, 28 November 2019 (diff | hist) (+761) Red Shift
- 06:43, 28 November 2019 (diff | hist) (+1,083) Redox Reaction
- 06:43, 28 November 2019 (diff | hist) (+502) Red Giant (current)
- 06:42, 28 November 2019 (diff | hist) (+1,320) Red Blood Cell
- 06:41, 28 November 2019 (diff | hist) (+1,038) Recycling
- 18:32, 27 November 2019 (diff | hist) (+1,048) Recessive Allele
- 18:31, 27 November 2019 (diff | hist) (+280) Receptor Cell
- 18:29, 27 November 2019 (diff | hist) (+520) Real Image
- 18:29, 27 November 2019 (diff | hist) (+265) Reactivity
- 18:28, 27 November 2019 (diff | hist) (+1,077) Reactivity Series
- 18:22, 27 November 2019 (diff | hist) (+1,284) Human Reaction Time
- 18:22, 27 November 2019 (diff | hist) (+525) Rate of Reaction
- 18:21, 27 November 2019 (diff | hist) (+1,084) Reaction Profile
- 18:21, 27 November 2019 (diff | hist) (+766) Reactant
- 18:20, 27 November 2019 (diff | hist) (+1,849) Ray Diagram
- 17:35, 27 November 2019 (diff | hist) (+732) Ratio
- 17:34, 27 November 2019 (diff | hist) (+2,433) Rate of Reaction
- 17:14, 27 November 2019 (diff | hist) (+270) Rarefaction
- 17:13, 27 November 2019 (diff | hist) (+1,793) Range
- 16:58, 27 November 2019 (diff | hist) (+805) Random Sampling
- 16:57, 27 November 2019 (diff | hist) (+1,265) Random Error
- 16:48, 27 November 2019 (diff | hist) (+1,002) Radioactivity
- 16:47, 27 November 2019 (diff | hist) (+285) Radioactive Tracer (current)
- 16:43, 27 November 2019 (diff | hist) (+521) Radioactive Decay
- 16:39, 27 November 2019 (diff | hist) (+1,051) Radiowave
- 16:39, 27 November 2019 (diff | hist) (-1) Radiation
- 16:30, 27 November 2019 (diff | hist) (+260) Radiation
- 16:19, 27 November 2019 (diff | hist) (+1,024) Quadrat
- 16:18, 27 November 2019 (diff | hist) (+753) Pyramid of Biomass
- 16:18, 27 November 2019 (diff | hist) (+209) P-wave
- 15:56, 27 November 2019 (diff | hist) (+264) Pulmonary Vein (current)
- 15:53, 27 November 2019 (diff | hist) (+257) Puberty (current)
- 15:51, 27 November 2019 (diff | hist) (+497) Protostar (current)
- 15:39, 27 November 2019 (diff | hist) (+1,501) Proton
- 15:02, 27 November 2019 (diff | hist) (+1,034) Protist
- 15:02, 27 November 2019 (diff | hist) (+1,996) Protein
- 15:01, 27 November 2019 (diff | hist) (+535) Protein Synthesis (current)
- 14:58, 27 November 2019 (diff | hist) (+254) Protease
- 14:57, 27 November 2019 (diff | hist) (+1,052) Prokaryotic Cell
- 14:56, 27 November 2019 (diff | hist) (+1,044) Progesterone
- 14:45, 27 November 2019 (diff | hist) (+512) Product
- 14:44, 27 November 2019 (diff | hist) (+255) Producer
- 14:44, 27 November 2019 (diff | hist) (+502) Probability
- 14:43, 27 November 2019 (diff | hist) (+254) Prism (Physics)
- 14:40, 27 November 2019 (diff | hist) (+4,226) Pressure
- 14:39, 27 November 2019 (diff | hist) (+259) Gestation (current)
- 13:20, 27 November 2019 (diff | hist) (+2,427) Prediction
- 13:12, 27 November 2019 (diff | hist) (+531) Preclinical Testing (current)
- 13:11, 27 November 2019 (diff | hist) (+1,286) Precise
- 13:10, 27 November 2019 (diff | hist) (+520) Precipitate
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