Evaluate which of the following statements about the great oxygenation event are true.

Evaluate which of the following statements about the great oxygenation event are true. Cyanobacteria in the oceans produced a large amount of oxygen as the product of a chemical reactionThe proportion of carbon dioxide in the atmosphere increasedCyanobacteria in the oceans used up most of the oxygen in the atmosphere for photosynthesisBefore the event, no organisms were capable of photosynthesisTotal available marks: 5

Which of the following regarding oxygen therapy is true?

factors that affecting oxygenation and give reference link below

5) Which of the following will cause the largest increase in systemic arterial oxygensaturation in the blood?a) an increase in red cell concentration (hematocrit) of 20%b) breathing 100% O2 in a healthy subject at sea levelc) an increase in arterial PO2 from 40 to 60 mmHgd) hyperventilation in a healthy subject at sea levele) breathing a gas with 5% CO2, 21% O2, and 74% N2 at sea level

Which of the following conditions is characterized by poor oxygenation of the blood?a) Jaundiceb) Cyanosisc) Pallord) Bronzing