The correct answer is - cyanobacteria.
The atmospheric oxygen came from the cyanobacteria. These were one of the earliest living organisms on Earth. The cyanobacteria was using photosynthesis in order to create its own food. The photosynthesis process requires sunlight, carbon dioxide, water, and oxygen. The oxygen is mostly released as a waste product from the process of photosynthesis, thus the cyanobacteria were literally releasing oxygen that was ending up into the atmosphere. As more and more cyanobacteria there were across the planet, more and more oxygen they were releasing into the atmosphere, slowly changing the composition of the atmosphere, and setting the basis of it as we know it now.
Ok so the answer will be C
D. Cambodia (mostly), Thailand, Vietnam
In the question the option that tells us the weakness of the sampling technique is that Samples were taken from both dark and bright lunar areas instead of concentrating on one area
<h3>What is a sampling technique?</h3>
The sampling technique can be defined as the name of the technique that helps in the identification of the specific process by which the entities that would be used in a sample has been chosen.
This is the way that the subset of a population can be used to make generalizations about the entire population that is existent in the study.
Hence we can ay that In the question the option that tells us the weakness of the sampling technique is that Samples were taken from both dark and bright lunar areas instead of concentrating on one area
Read more on sampling techniques here:
brainly.com/question/24466382
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Coal workers' pneumoconiosis (CWP), commonly known as "black lung disease," occurs when coal dust is inhaled. Over time, continued exposure to the coal dust causes scarring in the lungs, impairing your ability to breathe.
