Balance this equation: CH4 +2O2> ___ CO2 + ___ H2O a-1 CO2 + 1H2O
b-1 CO2+ 2H2O
c-2 CO2 + 1H2O
d-2CO2 + 2H2O

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins