Can someone answer me all of these questions

Amuscle that doesn’t need to be exercised regularly is your heart true or false ?

If you were running a marathon, which type of muscle fibers would be most useful to you? a. slow-twitch b. fast-twitch, type i a c. intermediate-twitch, type ii b d. slow-intermediate twitch, type i b select the best answer from the choices provided. a b c d

1. true or false decay destroys tooth enamel 2. true or false- tooth decay starts when plaque builds up on your teeth