What evidence do the similarities of the bones labeled A provide?

The answer to this is A. There are times when the bones may all look different at first glance. When the bones are checked further, this is when the similarities may seem evident. According to history, it is very likely that there are only certain species that were available in the past. As time passed by, these species evolved into new species. There are certain animals that come with thousands of varieties.

It can be quite interesting to know that they may have evolved only from one ancestor. Take note that this applies to all animals. This means that as long as there are similarities, the ancestors may be the same. An example of this is the similarity of the bone structure of bats and birds.