The ECM commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction.
Our subspecies has evolved since 500 years ago. As one example, take the changed prevalence of genetic diseases. As these are caused by alleles (and therefore the frequency of the relevant alleles has changed), and evolution is the change in allele frequencies in gene pools over generations, this is biological evolution. Humans are apes.
A gene is a heritable factor that controls a specific characteristic of an organism. An allele is one specific form of the gene, differing from other genes by one or a few bases only and occupying the same gene locus as other alleles of the same gene.