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
1) 0.3 m
2) 12000 m
3) 0.004 kg
4) 750000 mm
5) 3.5 L
6) 250000 g
7) 0.765 kg
8) 200 mg
9) 0.099 m
10) 500 ml
11) 52.163 kg
12) 881.849 lbs
13) 255.146 g
14) 2.963 oz
15) 18.597 kg
16) 0.178 m
17) 27.94 cm
18) 182.88 cm
19) 5.085 y
Answer:
Repeated heroin use changes the physical structure13 and physiology of the brain, creating long-term imbalances in neuronal and hormonal ...
Managers are often called supervisers because they watch employees that don't hold managerial spot that has a certain job activity
