Petra finds a discolored stain on the carpet at a suspected crime scene. What two presumptive tests might she use to determine if the stain is blood? First, Petra sprays the discolored area with , which returns a glowing blue color. However, she knows that this chemical might also turn blue with other substances that contain iron. Subsequently, she uses , which turns pink, indicating the presence of hemoglobin.
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Biology, 22.06.2019 01:50
Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules
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Biology, 22.06.2019 05:30
What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?
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Biology, 22.06.2019 12:20
Easy 6th grade work! 100 points! i need fast! compare the parts of a cell and the cell as a whole to another common nonliving system (i.e., a car, a city, describe the parts of a cell and their primary function.
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Biology, 22.06.2019 17:00
Evolution acts upon the population of organisms and not on each individual organism
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Petra finds a discolored stain on the carpet at a suspected crime scene. What two presumptive tests...
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