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
Just go to quiz lit and it’ll give you all the answers. I think you just use it on safari
1.) Your mental/emotional health, physical health and social well-being. You could strengthen your mental and emotional health by avoiding self-criticism, taking care of your body, give yourself time, surround yourself with good people, or take classes on stress management. To strengthen your physical health you could work out, eat right, and stay hydrated. Lastly, your social well-being can be strengthened by making friends, joining support groups, getting out, jointing clubs, etc.
2.) The 5 stages of grief Tyler could be experiencing are: denial and isolation, anger, bargaining, depression, and ultimately acceptance. You can support Tyler by offering help, understand his grief, let him know you’re there to listen, and be present with him after or during the funeral.
3.) The Yerkes-Dodson law is people that create a relationship between arousal and performance. Brittany could start experiencing stress on her cognitive processing, memory, and problem-solving, making it harder to achieve what she wanted to originally.
Answer:
leg tapping is one. And another is fitgiting with fingers and hands.
Twisting or pulling a muscle or tendon can result in a strain. It can also be caused by a single instance of improper lifting or by over stressing the back muscles. A chronic strain usually results from overuse involving prolonged, repetitive movement of the muscles and tendons. In addition, there are several factors that put a person at greater risk for a back strain or sprain, including excessively curving the lower back, being overweight, having weak back or abdominal muscles, and tight hamstrings (muscles in the back of the thighs). Playing sports that involve pushing and pulling—such as weightlifting and football—also increases the risk of a low-back injury. Chronic strains happen slowly over time from prolonged, repetitive overuse of muscles. Chronic strains develop from using the same muscle groups in the same pattern, causing even small stresses to build on one another. Causes of chronic strain include:
Improper body mechanics or using the wrong muscle groups for a task, such as repeatedly lifting heavy objects using your back instead of your legs
Improper sports mechanics or techniques, such as habitually gripping a tennis racket too tightly or an incorrect golf swing
Participation in the same exercises in the same way, day after day
Poor posture
Use of the wrong equipment, such as running shoes without the proper support for your foot type
