Assertion: mastodon's molar | /r/CapableOf | show by the age of 6–7 years
Facets:
Source sentences:
text: The fourth molars show by the age of 6–7 years, grow to a size of 6.8 cm (2.7 in) wide by 17.5 cm (6.9 in) long and are lost by the age of 22–23 years.