Answer:
A switch is used to make a circuit ON and OFF.
A holder is used with a lamp
Explanation:
Taking a nutritional supplement during times of stress has been scientifically proven to aid in stress management. Correct answer: D
Stress affects not just the mind but our entire system and when not poorly managed or addressed can lead to a host of long-term health problems and potentially lethal illnesses. That is why nutritional supplement is recommended for helping the body handle stress.
Answer: 
- Lead, cobalt, arsenic and selenium appear to pass the placental barrier by a diffusion mechanism. It was also found that the mercury levels in cord blood were almost double those of the mother, suggesting that the foetus may act as a filter for the maternal mercury levels during pregnancy.
Explanation:
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