Answer:
placenta
Explanation:
Nutrients and waste products are exchanged between the mother and her baby through the placenta and umbilical cord without any mixing of their blood.
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Answer: Smallpox and Measles
Explanation: With the arrival of Europeans in the Western Hemisphere, Native American populations were exposed to new infectious diseases, diseases for which they lacked immunity. These communicable diseases, including smallpox and measles, devastated entire native populations.
Brian is placed in isolation because he is high risk to infection because of the open wounds all over his body.
Lenny is required to wear special attire because she can transmit germs and bacteria to Brian’s wounds.
The Black Death was a plague that killed 75 - 200 million people in Europe in 1346 - 1353