Anna is observing slides of unlabeled organisms. the organisms are unicellular, have delicate glasslike cell walls with sculpturing, and show all the cell organelles, including chloroplasts. which organism is she observing?

Diatoms

Explanation:

From the description, only diatoms fits perfectly well. Diatoms are easily recognized by their glasslike cell wall.  

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls