Plsss help me with this

Which of the following is not am example of a polymer? protein nylon kevlar concreta

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up