_____ has/have become the manufacturing centers for many ...

[penza]

_____ has/have become the manufacturing centers for many substances that have made the lives of humans better and more productive.
 
  A) Insulin
  B) Bacteria
  C) Viruses
  D) Vaccines

Question 2

When the mock green is in bloom, the fragrance is often apparent before the plant is seen.
 
  Indicate whether the statement is true or false

[Toya9913]

Answer to Question 1

B

Answer to Question 2

False

[penza]

Excellent

[fatboyy09]

Thanks for the timely response, appreciate it