I'm afraid you won't believe me but here goes:
1.(about 15 years ago, elementary) men have one less rib than women
2 (recent, high school) there are two kingdoms of living things
3. let's vote!!!(regarding the validity of a conclusion, rather than finding an experiment or looking for additional data)
Yikes! Sounds like the problem is crappy teachers, not the curriculum itself..
There is no way I can dispute your claims since they are just anecdotal. Please provide some curriculum module or school documents showing that these things are part of the curriculum.