Invasive species can enter a habitat in many ways. how were these invasive species introduced?

A species of rats entered a habitat stowed away in a train.=unintentional introduction  

A man added invasive water hyacinths to beautify his private lake.=intentional introduction  

A flood prompted many aquatic species to inhabit a new area.=loss of habitat

6.3%

explanation:

the acceptance rate for yale university is 6.3%. this means that only 6 percent of people who apply actually get accepted!