No, not all mutations are harmful. Some mutations can be beneficial or neutral. This is because mutations are random changes in the DNA sequence, and their impact on an organism depends on the specific change and its effect on the function of genes or proteins. Beneficial mutations can lead to improved traits or adaptations, while neutral mutations may have no noticeable effect on an organism's fitness. However, harmful mutations can also occur, causing genetic disorders or reducing an organism's survival and reproductive success.
