Stains.
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Chemicals such as dyes, stains, or fixatives are commonly used in specimen preparation to make them more visible under a microscope. Dyes bind to specific cellular components, stains highlight certain structures, and fixatives preserve the specimen's morphology for observation.
Stains.
The general term is 'stain' of which there are several chemicals that can be used, depending on the specimen.
A meteor, sometimes incorrectly called a shooting star or falling star.
The morning star. Even though it is not a star, and even though it is not always visible in the morning, and is often visible in the evening. -- additional answer -- It is often called "the evening star" also.
A change in DNA sequence caused by a mistake in DNA replication or exposure to radiation or chemicals is called a mutation. Mutations can lead to variations in genes and can sometimes result in negative effects on an organism's traits or health.