High Maintenance: Requires daily cleaning and periodic "trimming" of keratin-based nail plates.
Around 4 to 6 million years ago, the hominin lineage began a radical shift. Fossil evidence from Australopithecus afarensis (the famous "Lucy") shows a foot that still possessed curved finger-like toes for climbing, but with the beginnings of a rigid arch. By the time of Homo erectus approximately 1.8 million years ago, the modern human foot had largely emerged. Key evolutionary changes included: Quick review: "feet"
: Our reliance on our feet is mirrored in our idioms. We "dig in our heels" when being stubborn, "get cold feet" when afraid, or "find our feet" when adjusting to a new situation. Write on the places your feet have traveled. Part of speech: noun (plural of "foot")