Answer:
A joint, or <u>articulation</u> , is the place of contact between bones, between bone and <u>cartilage</u> , or between bones and teeth. Bones are said to <u>articulate</u> with each other at a joint. The scientific study of joints is called <u>arthrology.</u>
Extrinsic, involving you caring what other people think of you
Answer:
1920s and 1930s,
Explanation:
it's worth reiterating that helmets were not mandatory. That wouldn't happen until 1943. During the 1920s and 1930s, variations of the leather helmet appeared, but in 1939, the game changed –or at least became safer– when John T. Riddel introduced the first plastic helmet
