Your design processes - for example, could you replace toxic substances with less harmful ones?

After many generations, the population has more helpful genetic differences, and fewer harmful ones.

After many generations of this, the population will have more helpful genetic differences, and fewer harmful ones.

It holds that in nature, mutations go from bad to worse: harmful ones are accumulated at a greater rate than beneficial ones.

In theory, this turns viruses - even harmful ones - into efficient cellular mechanics.

In small populations, it is not so reliable at spreading beneficial genes and eliminating harmful ones.

By filling every available niche, they do not let harmful ones get a toehold.

At the same time pesticides greatly damaged the insect population, dramatically reducing numbers of far more beneficial insects than harmful ones.

The advances for health and environmental protection are very significant; in the long term, the most dangerous substances will be replaced by less harmful ones.

It tries to examine all the aspects of relationships, the comic ones and sometimes the harmful ones.