The correct answer to this open question is the following.
Although there are no options attached or further references we can say the following.
Rob DeSalle studies genes and DNA. According to him, genes determine how complex living things are in that these genes specifically characterize every single living being on planet Earth.
For Rob DeSalle, the number of genes does not determine if you are a better species than others. Or the wrong idea that if some species have different amounts of genes this means that it has better DNA or is a superior species.
Desalle indicates that some amoebas have more DNA in their cells, compared to humans. For him, the key lies in how the species uses its DNA in order to determine its complex life.