The pH scale measures how acidic or basic a substance is, ranging from 0 to 14. A pH of 7 is neutral, below 7 is acidic, and above 7 is basic. In this case, the pH of the pond water decreased from 8.2 in 1950 to 5.2 in 2000, indicating that the water became more acidic over time.

I. Increased levels of dissolved oxygen: This is unlikely. Acidic waters can hold less dissolved oxygen than neutral or basic waters. Therefore, as the pH decreases, the level of dissolved oxygen would also likely decrease.

II. Increased levels of heavy metals: This is likely. Acidic conditions can cause heavy metals to leach from the surrounding soil into the water. Therefore, as the pH decreases, the level of heavy metals in the water would likely increase.

III. Increased number of fish species: This is unlikely. Most fish species prefer neutral to slightly basic conditions. Acidic conditions can be harmful or even lethal to many species of fish. Therefore, as the pH decreases, the number of fish species in the pond would likely decrease.

So, the correct answer would be "II only".

Question

The pH scale measures how acidic or basic a substance is, ranging from 0 to 14. A pH of 7 is neutral, below 7 is acidic, and above 7 is basic. In this case, the pH of the pond water decreased from 8.2 in 1950 to 5.2 in 2000, indicating that the water became more acidic over time.

I. Increased levels of dissolved oxygen: This is unlikely. Acidic waters can hold less dissolved oxygen than neutral or basic waters. Therefore, as the pH decreases, the level of dissolved oxygen would also likely decrease.

II. Increased levels of heavy metals: This is likely. Acidic conditions can cause heavy metals to leach from the surrounding soil into the water. Therefore, as the pH decreases, the level of heavy metals in the water would likely increase.

III. Increased number of fish species: This is unlikely. Most fish species prefer neutral to slightly basic conditions. Acidic conditions can be harmful or even lethal to many species of fish. Therefore, as the pH decreases, the number of fish species in the pond would likely decrease.

So, the correct answer would be "II only".

Knowee AI · Accepted Answer

The pH scale measures how acidic or basic a substance is, ranging from 0 to 14. A pH of 7 is neutral, below 7 is acidic, and above 7 is basic. In this case, the pH of the pond water decreased from 8.2 in 1950 to 5.2 in 2000, indicating that the water became more acidic over time.

I. Increased levels of dissolved oxygen: This is unlikely. Acidic waters can hold less dissolved oxygen than neutral or basic waters. Therefore, as the pH decreases, the level of dissolved oxygen would also likely decrease.

II. Increased levels of heavy metals: This is likely. Acidic conditions can cause heavy metals to leach from the surrounding soil into the water. Therefore, as the pH decreases, the level of heavy metals in the water would likely increase.

III. Increased number of fish species: This is unlikely. Most fish species prefer neutral to slightly basic conditions. Acidic conditions can be harmful or even lethal to many species of fish. Therefore, as the pH decreases, the number of fish species in the pond would likely decrease.

So, the correct answer would be "II only".

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