Question

1. the diagram below represents two processes that occur in some living organisms.

diagram: x + carbon dioxide + water → process a → high - energy sugars + oxygen; then process b → carbon dioxide + water + atp
describe how an increase in x would impact the end products of process a.

1. the graph shows the amount of oxygen in earth’s atmosphere from 3500 million years ago to present. scientists can use this information to learn more about the evolution of different species.

identify when during earth’s history plants most likely first appeared. describe evidence from the graph that supports this claim.

Explanation:

Question 3

Process A: Carbon dioxide + Water → High - energy sugars + Oxygen (photosynthesis, \(X\) is light energy). Process B: High - energy sugars + Oxygen → Carbon dioxide + Water + ATP (cellular respiration). If \(X\) (light) increases, more light for photosynthesis means more high - energy sugars and oxygen produced as products of Process A.

The graph shows oxygen levels over time. Early (3500 mya) low oxygen, then a drop, later rise. Scientists can relate oxygen to species evolution: low oxygen → anaerobic organisms; oxygen rise (e.g., from photosynthetic organisms) → aerobic organisms evolved, and complex life (needing oxygen) developed.

Plants do photosynthesis, producing oxygen. The graph's oxygen rise (around 500 - 1000 mya? Or when oxygen starts to rise after a low) suggests plants (photosynthetic) appeared when oxygen production increased. The graph's oxygen increase over time (after a low) supports that plants (producing oxygen) appeared when oxygen levels started to rise (e.g., when the graph shows oxygen increasing, likely due to plant photosynthesis).

Answer:

If \(X\) (light energy for photosynthesis) increases, the rate of Process A (photosynthesis) will increase. This leads to more high - energy sugars and oxygen being produced as the end products of Process A.

Question 4