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Answer:
Cells from the cheek are a type of epithelial cell, similar to skin. ... They can be seen faintly even at 40x (scanning power), but the most dramatic images are at 400x where the nucleus is clearly visible as a dark spot in the center of the cell.
Explanation:
Answer:
breed, while the ones not so well adapted die off.
Mutation- a permanent change in the DNA sequence that makes up a gene.