Many species of animals carry an allele for albinism (lack of pigmentation).
Albinos are usually pale or white in color.

Explain why the allele for albinism is present at a lower frequency than the allele for having pigments.

What conditions would be necessary for the albino allele to be more frequent?

a compound light microscope is used to magnify objects in steps.  

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the correct answer is option d.

an appositive is a noun, noun phrase or noun clause which follows another noun or noun phrase in order to describe it or name it another way. they are usually used between commas, brackets or dashes.

the example sentence with the correct use of commas is the following:

her uncle, the man over there in the red shirt, owns the hardware store in town.