the.com/arthropods
Earth's most successful tenants: jointed legs, external skeletons, and roughly a billion-to-one numerical advantage over you.
means Animals with segmented bodies, jointed limbs, and a hard external skeleton — insects, spiders, crustaceans, and centipedes among them.
from From Greek arthron (joint) and pous (foot), coined in the 1800s — literally the jointed-foot crowd.
Sheer numbersOver 80 percent of all known animal species.
Molt or dieThey shed their shells to grow bigger.
Ancient lineageTrilobites ruled seas before dinosaurs existed.
Blue bloodMany use copper, not iron, to carry oxygen.