Many factors influence the composition of Earth's atmosphere. Identify the correct statements about Earth's atmosphere. Click to select the correct answers. Cyanobacteria are early organisms that produced oxygen, increasing oxygen in early Earth's atmosphere. Animals produce carbon dioxide, increasing carbon dioxide in the atmosphere. Industrial activity on Earth reduces the amount of carbon dioxide in the atmosphere. The burning of fossil fuels increase greenhouse gases in the atmosphere. Plants convert carbon dioxide and water into oxygen, decreasing oxygen in the atmosphere. The most abundant gas released into the atmosphere from volcanic systems is water vapor. Sulfur dioxide gas from volcanoes can lead to acid rain and air pollution. Carbon dioxide produced by volcanoes adds to greenhouse gases in the atmosphere. Oxygen concentration in the atmosphere have increased from swamps, rice fields, and ruminant animals.