Select the correct answer from each drop-down menu.
Complete the statement with the appropriate answers.

Anne was a nineteenth-century forensic scientist. Her supervisor told her to conduct the crystal test for {1} to determine if there were any traces of {2} on glass found at the crime scene.

1 Choices: DNA , Hemoglobin, Hormones
2 Choices: blood, poison, chemicals

Explanation:

Since Anne is 19th century scientist, she would use conservative or classical methods of detecting blood traces on a glass at a crime scene because disovery of DNA was still not done. In 1853, Dr. Teichmann developed a test (also known as Teichmann test) that aim to crystallize haemoglobin when it is heated with glacial acetic acid. Since blood as haem group (hemin) and any surface that has traces of blood would react with glacial acetic acid and form crystals which can be then detected. This was one of the breakthrough discovery of  that time.

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.

very