Answer: I believe that it is not safe because if you were to say crush it up and snort it and you thought that is wasn't working so you did another and then maybe another then you might be taking more then what you where supposed to take in one setting.
Hope it makes since.
1. chemicals your brain releases when you exercise.
2. using your heart, lungs and blood vessels
3. the ability to last a long time without tiring
4.using your muscles
5.using oxygen
Answer:
Re-emerging infectious diseases.
Explanation:
These types of diseases that were exterminated but now have came back are typed as 'Re-emerging diseases'. The diseases where once eradicated but now they have mutated and evolved to stronger strains. The diseases that were once controlled have now have had more reported cases and gaining popularity have 'emerged' once again into the world.
Due to parents not wanting to vaccinate their children from common diseases like polio and measles, this could become an epidemic.
Explanation:
The cardiovascular system pumps blood throughout the body. As the blood is circulating out of the heart it is filled with oxygen and nutrients. These nutrients get divided to the rest of the cells in the body. As the blood is coming back into the heart the urinary system takes the waste out of it.
So basically, it basically acts as a delivery system delivering O2 and nutrients and takes waste out of the cell.
What role does exposure to sunlight during the day play in improving sleep?
It helps to regulate circadian rhythm.
