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The correct answer is:
<span>b. Department of Homeland Security
This department was created in November 2002, and it was in direct response to the attacks. Its primary purpose was the protection of the territory of the United States from any future attacks. </span>
Answer: A primary positive effect of the Columbian Exchange is increased food supply of both the Old World and the New World. Various crops such as wheat, barley, and rye, were introduced by Columbus and his followers.
Explanation:
Counterstains are chosen to be contrasting colors so that the primary satin target can be easily distinguished from the contrasting background.
<h3>
What is counterstain?</h3>
- A counterstain is a stain that contrasts with the primary stain, making the stained structure visible under a microscope.
- A counterstain is a color that is introduced into specific cellular structures in order to create a contrast to the colored enzyme substrate.
- Counterstaining improves vision and target localization, allowing for a more accurate assessment of morphology and cell organization within a tissue section.
- Counterstains are intended to be opposing colors in order for the principal satin target to stand out against the contrasting background.
- The counterstain utilized in this procedure is Safranin.
- Gram staining is used to differentiate Gram-positive from Gram-negative bacteria.
Therefore, counterstains are chosen to be contrasting colors so that the primary satin target can be easily distinguished from the contrasting background.
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The correct question is given below:
Why is it essential that the primary stain and the counterstain be of contrasting colors?