The Muller-Lyer illusion and the Ponzo illusion are both examples of C. Visual Illusions
You forgot to put the answer choices, but by process of elimination the choice that shows someone living a healthy, drug-free live will be correct.
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
what I remember from my health class on this it should be somewhere between 60-90 percent of your MHR depending on what type of high intensity exercise your are doing such if your are starting out a new program, to increase overall strength and endurance, or increase your work capacity. The MHR can change for each one of these, but overall it should be the above.
