D. Biological activity
Explanation:
The earth's atmosphere became oxygen rich as a result of biological activities. Early earth atmosphere was toxic one and in its reducing state.
- The activities of micro-organisms such as cyanobacteria led to the production of oxygen.
- These organisms manufacture their food in the presence of sunlight and water in the process of photosynthesis.
- The bye product of this reaction is oxygen.
- The intense presence of these living organisms led to the surge in atmospheric oxygen.
Learn more:
Photosynthesis brainly.com/question/4216541
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The electron transport chain
Cause it's when the rain sets and the air gets in it so yeah
In my past learnings, Sample size is no. of units in a population that need to be studied. The number of units can include animals, persons, or any specific or specified circumstances. Hope this helped..!
Answer:
integumentary,and nervous
Explanation:
those two answer choices fit the function and systems involved in the chicken wing.the other two are way off
