Answer to question four is B
Seat belts and airbags were inserted into cars around the time of the late 1950s so the rate of death during a car accident would decrease because people are more likely to survive. And then in 1991 Side Impact Protection System (SIPS) was placed into cars again reducing fatalities during a car incident as people became more protected. :)
Answer:
Carbon dioxide: Carbon dioxide is a molecule composed of one carbon atom bonded to two oxygen atoms via two double bonds. Carbon dioxide is a byproduct of exhaling and from the burning of fossil fuels. Its natural existence is in the form of a gas, which is inert and non harmful to humans in very low concentrations.
