What is associated with: about 4000 years ago the mesopotamians reinvented the wheel using these to make it lighter?

Based on the clue 'about 4 million of these live in canada most are p...', what is the answer? Based on the clue 'about 40 of your body weight consists of 100s of t...', what is the answer? Based on the clue 'about 400 bc the persians began knitting these so...', what is the answer? What is associated with: about 4000 cherokee indians died on the trail of these in the late 1830s? What is associated with: about 40000 men were left in this french port after the last evacuation ship left june 4 1940? Based on the clue 'about 45 billion years old its the closest g2 type...', what is the answer? Based on the clue 'about 5 5 in real life he towers nearly 17 feet ab...', what is the answer? Based on the clue 'about 50 of the togolese practice native african r...', what is the answer?