Question

a permanent change in the dna sequence which can affect a single gene or group of genes
gene mutation
homeostasis
somatic cell
chromosomal mutation

Explanation:

The definition describes a permanent DNA sequence change affecting a single gene or group of genes. Gene mutation refers to changes in a single gene's DNA sequence, while chromosomal mutation affects larger chromosomal segments. The definition's focus on single or groups of genes aligns best with gene mutation. Homeostasis is stable internal conditions, and somatic cells are body cells, neither matching the definition.

Answer:

A. Gene Mutation