11. true / false today, scientists use genetic similarities between species to
classify them as related species, rather than focusing on physical or structu

True.

Explanation:

In genetics, genetic similarities indicate the actual species. It also helps to identify the relationship or similarities between different species.

A physical character or structure can't be a measurement process of classifying any species as related to other species.

Such as Chimps is 90% genetically similar to human, but they not identical in physical appearance.

So, at present, scientists use genetic similarities between species to help classify them as related species, rather than focusing on physical or structure of any species.

Hope this helps