Understanding is the right answer
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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1) I would choose white blood cells since their main job is to fight infection (Something that does not belong as a part of the body) But since their is several types of white blood cells the ones too look out for would be the Neutrophils since they kill bacteria by ingesting them.
2) It would be a Neutrophils blood cell. They are 12-14 µm diameter, and so look bigger than the surrounding red blood cells. There is a single nucleus, which is multilobed, and can have between 2 and 5 lobes.
3)You would also have to watch out for: Granulocytes – cells which contain granules which contain chemicals that are used to kill bacteria and viruses Lymphocytes- cells which attack most of the bacterial and viral infections in our bodiesMonocytes - cells which become macrophages, large cells that engulf harmful particles in our bodies.
filtration in blood and create urine as a waste by product.
Answer:
Barbers
Explanation:
I searched it up on Google and it took me to a Quizlet with the answer. Hope this is correct!!
