1.2. Technology has positively impacted the environment by a) increasing greenhouse gas emissions b) reducing the use of renewable energy sources Cc) improving waste management and recycling d) decreasing the use of public transportation 1.3. What do gears do in a machine? a) Make it go faster b) Make it go slower c) Change direction d) Give it more power 1.4. The gear ratio is a) Number of teeth on big gear + number of teeth on small gear b) Number of teeth on small gear + number of teeth on big gear c) Number of teeth on big gear x number of teeth on small gear d) Number of teeth on small gear x number of teeth on big gear 1.5. What is the main function of a frame structure? a) To provide support b) To reduce friction C) To increase speed d) To change dire