Final answer:
The gas on Venus that we also have on Earth is carbon dioxide (CO₂). Venus' atmosphere contains about 96% carbon dioxide, much more than Earth due to different geological and biological processes.
Step-by-step explanation:
The gas on Venus that is also found on Earth is carbon dioxide (CO₂). Venus' atmosphere is predominantly composed of carbon dioxide, accounting for about 96% of its atmosphere, with nitrogen being the second most common gas. Earth's atmosphere contains carbon dioxide too, but in much smaller quantities because on Earth, this gas has been largely locked up in marine sediments and removed by the process of photosynthesis by living organisms. This is in stark contrast to Venus, where the atmospheric conditions have led to a far greater prevalence of carbon dioxide in the atmosphere.