Carbon monoxide is a gas produced by furnaces and other devices that burn fuel, and any fuel that is incompletely burned produces carbon monoxide, a colorless, odorless gas. Given these facts, what happens when a fuel burns incompletely among the following options: - Carbon monoxide disappears - direct damage to the lungs - deadly and devastating - Carbon monoxide is created - retaining heat - Oxygen increases - permineralization - It's recycled
Carbon monoxide is created

Better senses have a positive impact on an animal 's survival, and living and surviving are the thing. Given these facts, what do better senses have an impact on among the following options: - passing gas - population movement - blood type - important habitats - animals with backbones - ability to live - body odor - athletes
ability to live

Extreme heat and pressure change rock into metamorphic rock, and marble is a form of metamorphic rock. Given these facts, what does extreme heat and pressure change rock into among the following options: - coal - crust - forces - calcite - an object - marble - soils - mines
marble