Hey gente yo no se inglés y vivo acá en estados unidos , tengo menos de un mes estudiando y estoy aprendiendo , mañana tengo un examen de social studies y es de 24 preguntas , que puedo hacer para aprendérmelo , es muy difícil por que esta en inglés , por favor ayuda

As our current atmosphere formed, the concentrations of various atmospheric gases fluctuated. match each gas with the explanation that best describes how its proportion changed during the evolution of the atmosphere.

"“forty or fifty years ago, many people thought that simply transferring technologies from industrialized to developing countries would close the technology gap. now we know that technologies developed in industrialized countries may not be suitable for use in other environments. they may require a particular type of infrastructure to operate. they may need specialized parts or knowledge to mend when they break we now understand that innovative capacity must be built in different ways." - united nations secretary-general ban ki-moon based on the secretary general's comments, which of these would be most important for a country to improve? a) native literature b) transportation grid c) cultural traditions d) construction styles

The biggest component / ingredient of summer time smog is