These divisions are not sufficient for distinguishing and describing all speech sounds. Most of the teeth have uniquely distinguishing features. Popper proposed falsifiability as an important criterion in distinguishing science from pseudoscience. Both U+0027 and U+2019 are ambiguous about distinguishing punctuation from apostrophes. Spore morphology is useful in distinguishing between different species. Height is not the sole criterion for distinguishing horses from ponies. There are two main hypotheses on the cognitive mechanisms that mediate host distinguishing of eggs. Others have raised concerns about the difficulty of distinguishing civilians from combatants. Some analytical techniques are capable of distinguishing organic from inorganic forms of the element. There are numerous minimal pairs of words distinguishing only and . Gender blindness is the practice of not distinguishing people by gender. It has been characterized as serving up distinguishing blasts of surrealism. Otherwise there would be no sense in distinguishing from . Some analytical techniques are capable of distinguishing organic from inorganic forms of the metal. This may cause difficulty in distinguishing between subdural and epidural hemorrhages.