Question

10 multiple choice 4 points
what is a direct consequence of ocean acidification?
reduced sea level rise
increased fish populations
weakened shells and skeletons in marine organisms
enhanced coral reef growth
11 multiple choice 4 points
what is the primary benefit of choosing locally sourced and seasonal foods?
higher cost
reduced transportation impact
limited variety
lower quality
12 multiple choice 4 points
what is an example of an ecosystem service provided by nature?
manufacturing of cars
building of houses
cleaning of air and water by plants
recycling of plastic bottles

Explanation:

• Question 10: Ocean acidification lowers seawater pH. This makes it harder for marine organisms (like corals, mollusks) to build calcium - carbonate shells/skeletons as the carbonate ions ($\ce{CO^{2-}_{3}}$) needed for shell formation are less available. So, weakened shells and skeletons in marine organisms is a direct consequence.
• Question 11: Locally sourced and seasonal foods don't need to be transported long - distances. Long - distance food transportation (e.g., by trucks, ships) consumes fossil fuels and emits greenhouse gases. Reducing transportation distance reduces this environmental impact.
• Question 12: Ecosystem services are the benefits humans get from ecosystems. Plants naturally clean air (through photosynthesis, absorbing pollutants) and water (filtering runoff). Manufacturing cars, building houses, and recycling plastic bottles are human - made activities, not natural ecosystem services.

Answer:

1. Weakened shells and skeletons in marine organisms
2. Reduced transportation impact
3. Cleaning of air and water by plants