- 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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6 0

2 years ago

Which of the following statements is true?

Neporo4naja [7]

I would say that the answer is D. Hope this helps...

4 0

2 years ago

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when antibiotics were first developed,most infectious diseases could be controlled by them. today certain bacteria are resistant

riadik2000 [5.3K]

Through mutations in the DNA of bacteria, they can adapt. Only the mutated bacteria would live and keep producing bacteria with the same mutation. Eventually, they would be immune to antibiotics.

5 0

2 years ago