Question

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soon after melissa walks barefoot along the wet banks of a local river, a red, itchy rash appears on the soles of her feet. what is the type and source of the illness?
it is an acute effect of a toxin in the river.
it is a chronic effect of a toxin in the river.
it is a combined effect of toxins.
it is a canceling effect of toxins.
question 2
3 pts
(03.03 mc)
in town a, the water has heavy metal q, and the residents who drink it have long - term kidney damage. in town b, the water has heavy metals q and r, and the residents who drink are healthy. what conclusion can be made about the two metals?
only one of the metals is causing an acute effect.
both metals cause an acute effect and not a chronic effect.
the heavy metals have a combined toxic effect.
the heavy metals have a canceling toxic effect.

Explanation:

• Question 1: An acute effect occurs soon after exposure. Melissa's rash appeared soon after walking barefoot (exposure), so it's an acute effect. Chronic effects develop over time. Combined and canceling effects involve multiple toxins. Here, only one exposure (river walk) is mentioned.
• Question 2: In Town A, metal Q causes kidney damage (toxic). In Town B, metals Q and R together result in no harm (healthy residents). This implies that R cancels the toxic effect of Q. Acute effects are short - term (not indicated here as it's long - term kidney damage in Town A). Combined toxic effect would mean more harm, but there's no harm in Town B.

Answer:

1. It is an acute effect of a toxin in the river.
2. The heavy metals have a canceling toxic effect.