Pleasssee help me How can we use the part interactive simulation to model buiding simple molecules​​

Which greenhouse gas is emitted when burn fossil fuels for energy? a.nitrogen b.oxygen c.carbon dioxide d.helium

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution

Modern sea star larvae resemble some primitive vertebrate larvae. this similarity may suggest that primitive vertebrates