The backpack's main force that it it is exerting on the body's back and hips is coming from gravity, and can pull the spine downwards. This is why it's important to ear both straps.
Answer:
The body tissues biomechanical advantages are -
Energy conservation through economy of movement. Helps eliminate muscle imbalances. Reduces wear and tear on joints and ligaments. Improved sport specific form and technique.
Explanation:
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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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