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spin [16.1K]
3 years ago
13

The fossil record shows life originated on Earth at least 3.5 billion years ago and consisted entirely of microorganisms. Paleon

tologists provide the strongest evidence of this conclusion through the discovery of:______.
Biology
1 answer:
klio [65]3 years ago
3 0

Answer:

stromatolites

Explanation:

Stromatolites or stromatoliths are layered mounds, columns, and sheet-like sedimentary rocks that were originally formed by the growth of layer upon layer of cyanobacteria, a single-celled photosynthesizing microbe. Fossilized stromatolites provide records of ancient life on Earth.

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Answer:

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Explanation:

Etiology is the study of origin or cause of any disease. Pathogenesis is the mechanism of causing disease by any pathogen. Pathogens use four-step to become pathogenic which are contact, colonization, invasion, and infection.  

In pathogenesis the symptoms of disease is observed not the cause so in option B increasing serum ammonia level is the symptom of liver cirrhosis which characterize pathogenesis rather than etiology and in other option, only cause of a medical condition is described so the correct answer is B.

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