When a specimen is to be observed under the light microscope, scientists usually stain the specimens using different type of chemical stains depending on the type of specimen to be observed. Staining of specimen make the structures that are to be observed in the specimen very visible under the microscope, this make it easy for scientists to observe their structures.
D. Chromosomes
DNA in the nucleus is found in structures called chromosomes.
Answer: Biological Test Biological tests are frequently used to validate the physical and chemical tools or to provide complementary evidence about bioavailability process in a system. From: Chemosphere, 2017
Explanation:
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