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
<span>You Could lose approx 34 ounces of water from sweat but of course, that's when you work out and stuff.</span>
You could probably buy a tester <span />
Answer:
source of energy but c too
