Can we get a moderator to help? why do my crowns go away? I had 7, and now i have 1...

23. public and private investment in infrastructure include all of the following except a) worker knowledge and skill development b) telecommunication systems, internet provider systems, and power distribution systems c) highways, transit systems, airports, harbors, and educational facilities d) fire departments, police departments, and public safety systems e) water systems, wastewater treatment systems, and navigational systems

Ihave made a dive then stayed on the surface for a while. after this surface interval my pressure group is k. what is the maximum amount of bottom time available when doing a repetitive to 17/56 feet

The nervous system is responsible for our fight-or-flight response. a.autonomicb. parasympatheticc. somaticd. sympathetic  select the best answer from the choices providedabcd