Regarding the bipedal claim it is not specific enough, what is the quantifier? "All"? "Most"? "Some"? Your second claim (humans are either male or female) uses

Regarding the bipedal claim it is not specific enough, what is the quantifier? "All"? "Most"? "Some"? Your second claim (humans are either male or female) uses "All". If there are exceptions then we have a contradiction.