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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They are produced by specialized white blood cells called B lymphocytes<span> (or B cells). </span>
The answer here is B they are each made of matter. some are compounds, and some are elements they all contain Atoms this is because Silver and Oxygen are elements while Carbon Dioxide and Water are compounds. Although you do not have the choices down, I have come across this question before.
It would not be answer C because a majority of supplements are not approved by the FDA. This does not make them anymore effective. The answer is D.
Where are the answer choices?
