Which best summarizes the effects of mutations on organisms? mutations are sometimes , sometimes harmful, and sometimes neutral. mutations are usually harmful, sometimes neutral, and never . mutations are sometimes neutral, sometimes , and never harmful. mutations are always harmful, never , and never neutral.

Mutations are sometimes helpful, sometimes harmful, and sometimes neutral.

Explanation:

Mutations can be defined as permanent, heritable changes in genetic material due to alterations in its nucleotide sequence. Mutations may harmful that cause deleterious effects, such as mutations that lead to development of cancer.

Mutations are sometimes beneficial, such as mutation that leads to development of resistance against a disease.

Mutations may neutral also that do not show any effect, such as silent mutations that do not change amino acid sequence encoded by a gene.

Thus, the correct answer is first option.

the answer is d.) homologous; have mammary glands