When a system is at equilibrium states: (A) the concentration of reactants and products becomes equal
(B) the opposing reactions (forward and reverse) stop
(C) the rate of the reverse reaction becomes very low
(D) the rates of the forward and reverse reactions become equal​

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

1. list three scientific reasons cockroaches may fly.

Which describes fat? a: a carbohydrate that produces energy b: a nucleic acid that directs cell function c: a lipid that stores energy d: a protein that speeds up a chemical reaction