Question

describe the biological chemical processes that were responsible for producing oxygen in earths atmosphere, eventually leading to the cambrian explosion.
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question 2
explain the importance of oxygen in the evolution of large multicellular animal life.
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question 3
discuss the geologic processes that formed the continents during the precambrian era.

Explanation:

Question 1: Cyanobacteria carried out photosynthesis. They used sunlight, carbon - dioxide and water to produce oxygen as a by - product. Over time, oxygen accumulated in the atmosphere, enriching it and setting the stage for the Cambrian Explosion.
Question 2: Oxygen is crucial for aerobic respiration, which provides more energy (ATP) than anaerobic respiration. This increased energy availability was essential for the development, growth and maintenance of large multicellular organisms with high - energy demands such as complex organ systems.
Question 3: During the Precambrian era, processes like volcanic activity, seafloor spreading and plate tectonics contributed to the formation of continents. Volcanic eruptions released magma that solidified to form new crustal material, and plate movements led to the aggregation and growth of continental masses.

Answer:

Question 1: Cyanobacteria photosynthesis produced oxygen that accumulated in the atmosphere.
Question 2: Oxygen enabled more energy - efficient aerobic respiration for large multicellular life.
Question 3: Volcanic activity, seafloor spreading and plate tectonics formed continents in the Precambrian era.