Answer:
The answer to this question is ‘A.’
Explanation:
The answer to this question is ‘A’ Metric measurement system is a decimal-based measurement system. That’s why it is based on divisions that are powers of ten. In Europe, people have commonly used a gram-centigrade based system for measurement. There is a total of two scientific methods of analysis. The metric system is not anymore based on the wavelength of krypton 86 radiation.
Answer: B. Two
Explanation:
During the first stage, your body starts relaxing and falling into sleep. This is the lightest stage of sleep. You can wake easily during this stage, and are not "fully" asleep.
During the second stage, your body deepens into it's sleep, your heart rate decreases, your body temperature decreases, and more. <em>This is the stage that "represents the beginning of actual sleep" which is the answer to your question.</em>
During the third stage, your body is in a deeper state of sleep. Your muscles relax further, your breathing rate slows, and more.
During the fourth stage, your heart rate and body temperature rise again. Your brain is a bit more active, and your muscles start to "wake up" slowly again.
<em> Read more about </em><em>NREM sleep</em><em> here:</em>
<em>brainly.com/question/14410334</em>
