Question

1. which practice has the greatest impact on conserving water?a. only washing full loads of clothes in the washing machineb. limiting the addition of water to swimming pools to once per weekc. taking showers in the morning instead of at night6. an algae population in an ocean ecosystem is exposed to a toxic substance. the graphic below shows the amount of toxic substance present in each organism as it moves through a food chain.which practice would have the greatest effect on reducing bioaccumulation of a toxin?a. clean up the toxic substance affecting the algaeb. add additional algae to the food chain that are not affectedc. supply the killer whales with a food source other than salmond. add an additional animal to the food chain to dilute the effect of the toxic substanceremediation 5.2 human impactpage 2 / 4

Explanation:

For question 4:

• Option B: Swimming pools lose water to evaporation, so weekly refills are a regular need and do not save significant water.
• Option C: The time of day for showers does not change the total water used.
• Option A: Washing only full loads reduces the number of machine runs, cutting total water consumption per load of laundry significantly.

For question 6:

• Bioaccumulation starts with the base of the food chain (algae here) absorbing toxins, which then build up in higher trophic levels.
• Option A: Removing the toxin at the source (algae) stops the initial entry of the toxin into the food chain, eliminating the root cause of bioaccumulation.
• Options B, C, and D only reduce or dilute the toxin partially but do not stop it from entering the food chain initially.

Answer:

1. A. only washing full loads of clothes in the washing machine
2. A. clean up the toxic substance affecting the algae