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
C) speaking in a moderate and assertive tone
Diabetes and heart disease can be found
I believe the answer is Extension. Considering flexion would decrease the angle. Hope this helps :)