Question

question 32
scientists hypothesize that oxygen began to accumulate in earths atmosphere after the appearance of living things with the ability to

• form tissues
• photosynthesize
• breathe air
• reproduce sexually

question 33
photosynthesis and cellular respiration are thought to be a cycle because

• the reactants of both are the same
• the products of one are the reactants of the other
• the products of one are the products of the other
• the reactants of one are the reactants of the other

Explanation:

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"Cellular Respiration"
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"Great Oxidation Event",
"Cellular Respiration"
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<reasoning>

Analyze the accumulation of atmospheric oxygen

Scientists hypothesize that Earth's early atmosphere lacked free oxygen. The accumulation of oxygen, known as the Great Oxidation Event, began after the evolution of autotrophic organisms capable of Photosynthesis. These early photosynthetic organisms (specifically cyanobacteria) used water and carbon dioxide to produce organic compounds, releasing oxygen gas as a byproduct. Therefore, the ability to photosynthesize is the key biological innovation responsible for oxygen accumulation.

Analyze the relationship between photosynthesis and respiration

Photosynthesis and cellular respiration are complementary biochemical pathways. The chemical equation for photosynthesis is:
\[6\text{CO}_2 + 6\text{H}_2\text{O} + \text{light energy}
ightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2\]
The chemical equation for aerobic cellular respiration is:
\[\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2
ightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{ATP}\]
Comparing these processes, the products of photosynthesis (glucose and oxygen) serve as the reactants for cellular respiration, and the products of cellular respiration (carbon dioxide and water) serve as the reactants for photosynthesis. This relationship forms a continuous cycle of matter.
</reasoning>

<answer>

Question 32

<mcq-option>form tissues</mcq-option>
<mcq-correct>photosynthesize</mcq-correct>
<mcq-option>breathe air</mcq-option>
<mcq-option>reproduce sexually</mcq-option>

Question 33

<mcq-option>the reactants of both are the same</mcq-option>
<mcq-correct>the products of one are the reactants of the other</mcq-correct>
<mcq-option>the products of one are the products of the other</mcq-option>
<mcq-option>the reactants of one are the reactants of the other</mcq-option>
</answer>

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Answer:

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"Cellular Respiration"
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<reasoning>

Analyze the accumulation of atmospheric oxygen

Scientists hypothesize that Earth's early atmosphere lacked free oxygen. The accumulation of oxygen, known as the Great Oxidation Event, began after the evolution of autotrophic organisms capable of Photosynthesis. These early photosynthetic organisms (specifically cyanobacteria) used water and carbon dioxide to produce organic compounds, releasing oxygen gas as a byproduct. Therefore, the ability to photosynthesize is the key biological innovation responsible for oxygen accumulation.

Analyze the relationship between photosynthesis and respiration

Photosynthesis and cellular respiration are complementary biochemical pathways. The chemical equation for photosynthesis is:
\[6\text{CO}_2 + 6\text{H}_2\text{O} + \text{light energy}
ightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2\]
The chemical equation for aerobic cellular respiration is:
\[\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2
ightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{ATP}\]
Comparing these processes, the products of photosynthesis (glucose and oxygen) serve as the reactants for cellular respiration, and the products of cellular respiration (carbon dioxide and water) serve as the reactants for photosynthesis. This relationship forms a continuous cycle of matter.
</reasoning>

<answer>

Question 32

<mcq-option>form tissues</mcq-option>
<mcq-correct>photosynthesize</mcq-correct>
<mcq-option>breathe air</mcq-option>
<mcq-option>reproduce sexually</mcq-option>

Question 33

<mcq-option>the reactants of both are the same</mcq-option>
<mcq-correct>the products of one are the reactants of the other</mcq-correct>
<mcq-option>the products of one are the products of the other</mcq-option>
<mcq-option>the reactants of one are the reactants of the other</mcq-option>
</answer>

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