According to the video, the work of Heating and Air Conditioning Mechanics and Installers combines the skills of which workers? Check all that apply. Pump Operators Plumbers Electricians Refrigeration Specialists Power Plant Technicians Hydroelectric Production Managers

i only have part a but here is the first one: - lewis and clark are born

- lewis marries sacajawea and clark is jealous  

- clark drowns lewis and then goes to jail

answer; conditional stimulus will trigger a conditioned response;

answer; coal reserves in the u.s are far greater than petroleum reserves;