Question

1. when was the first bulletproof vest invented? a. 1964 b. 1975 c. 1990 d. 2006 3. for which of the following characteristics is kevlar known? a. heat resistance b. strength c. durability d. all of the above 4. who is credited with inventing kevlar? a. robert kevlar b. richard arme c. stephanie kwolek d. none of the above 5. which of the following caused the search for a fabric like kevlar?

Explanation:

1. The first modern - type bulletproof vest was invented in the 1970s. Among the options, 1975 is the closest.
2. Kevlar is known for its heat resistance, strength, and durability.
3. Stephanie Kwolek is credited with inventing Kevlar.

Answer:

1. b. 1975
2. d. All of the above
3. c. Stephanie Kwolek