Someseaurchins海胆havevenomous(toxin)spines

The wheels of the first road vehicles were fashioned from crude stone disks.

The first paper was made from the bark of the mulberry tree.

Thefearofsmallpox,whichterrorizedtheeighteenthcentury,hasnoanalogy(likeness)today.

Alllivingorganisms,regardlessoftheiruniqueidentity,havecertainbiological,chemical,andphysicalcharacteristicsincommon.