Human Bio, as a subject, should be taught at every school - it isn't fair on students and teachers to remove a subject from the curriculum due to there being overlap in content with other subjects when there are countless subjects that have overlaps, such as Bio & Ess or Ess & Forestry or Exercise science & Bio or even Chem & Bio. Students are excited to learn the content and teachers are excited to teach it - That should be the only determining factor on whether a subject should be taught or not.