The correct answer is a series of distinctive anatomical traits that contrast with archaic traits from earlier hominins.
The study of human evolution focuses on the events which led to the development of the human species <em>Homo sapiens</em> as we know it now. The group of hominins includes the modern humans, extinct human species and our immediate ancestors. Earlier hominins possessed some characteristics which are distinctive from the modern humans.
The correct answer to two proteins that share 30% amino acid identity are 30% homologous is false.
Although homology can be inferred from excess similarity and excess similarity can be recognized from statistical estimates (E()-values), most researchers prefer to describe similarity in terms of "percent identity." Although it is a common rule of thumb that two sequences are homologous if they are more than 30% identical across their entire lengths (much higher identities are seen by chance in short alignments), the 30% criterion misses many easily detectable homologs. While 30% identical alignments over more than 100 residues are almost always statistically significant, many homologs with E()-values 1010 that are not 30% identical are readily found. As a result, E()-values and bit-scores (described below) are far more useful for inferring homology.
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All organisms do have a closed circulatory system
so A <span />
I would belive so cuz every thing breaks down