Answer:
a.migration stream: 4. a group of people who move from one area to another area during the same time period
b. pandemic: 5. a worldwide spread of a deadly disease, e.g., the plague
c. countermigration stream: 2. a group of people who have recently moved to a new area and who return to their original location during the same time period
d. diffusion: 3. the movement of a characteristic from one place to another over a period of time
e. bubonic plague: 1. a deadly, very contagious disease, carried by fleas and rats
Hope this helps I wanted it to be accurate
Because it’s converted into phenylalanine in the body
i don’t really understand the question could you word it better