Question

as a result of dna testing, scientists learned the black death was the pneumonic plague, not the bubonic plague. both the pneumonic plague and the bubonic plague. caused by parasites found in drinking water. caused by parasites such as bed bugs.

Explanation:

The Black Death was a pandemic that occurred in the 14th century. DNA testing has shown that it was a combination of both pneumonic and bubonic plague. Pneumonic plague affects the lungs and can be transmitted through the air, while bubonic plague is transmitted by fleas. The other options are incorrect: it was not just pneumonic plague (first option), it was not caused by parasites in drinking water (third option), and bed bugs were not the vector (fourth option).

Answer:

both the pneumonic plague and the bubonic plague.