Scientists believe that the earth's early atmosphere lacked gas because photosynthetic organisms did not yet exist

The right answer is C. Oxygen

During photosynthesis, there is consumption of carbon dioxide and water to produce glucose and dioxygen. Glucose is the "fuel" of its growth. Cellular respiration will consume some of this glucose and oxygen to form oxygen and water.

So, if the atmosphere was lacking oxygen, it's simply because there was no photosynthesis producing oxygen.

the elements of art are the visual tools that the artist uses to create a composition. these are line, shape, color, value, form, texture, and space.

the principles of art and design are balance, contrast, emphasis, movement, pattern, rhythm, and unity/variety.