Question

cyanobacteria began to emerge as a life - form.
oceans contained far less salt than they do today.
oxygen spilled into this sphere from ocean waters.
oxidation in rocks and minerals was not possible.
atmosphere
biosphere
hydrosphere
lithosphere

Explanation:

• Atmosphere: Oxygen spilled into this sphere from ocean waters. The atmosphere is the layer of gases surrounding the Earth, and oxygen is a major component of it.
• Biosphere: Cyanobacteria began to emerge as a life - form. The biosphere encompasses all living organisms on Earth.
• Hydrosphere: Oceans contained far less salt than they do today. The hydrosphere includes all water bodies on Earth, such as oceans.
• Lithosphere: Oxidation in rocks and minerals was not possible. The lithosphere is the rigid outer layer of the Earth, composed of rocks and minerals.

Answer:

• atmosphere: Oxygen spilled into this sphere from ocean waters.
• biosphere: Cyanobacteria began to emerge as a life - form.
• hydrosphere: Oceans contained far less salt than they do today.
• lithosphere: Oxidation in rocks and minerals was not possible.