28. Which of the following is the greatest contributor to greenhouse gases in the United States? production of electricity
transportation
industrial pollution
residential pollution

Using the periodic table, determine which material is most likely a good conductor

Variety of living organisms; includes genetic, species, and ecological types.

Which must be kept in mind when determining if an explanation is correct? check all that apply.which must be kept in mind when determining if an explanation is correct? check all that apply.