Nelly was reading about ecological pesticides. she found a website that said that skeletons of some organisms settle as sediments in the ocean. they are then used as pesticides because they are abrasive against pests. which organism is the article discussing? a. dinoflagellates b. diatoms c. green algae d. euglenoids e. amoeba

The answer is B. When diatoms die and fall off the ocean column to the ocean floor, they become part of sediments over time. When they are mined and exposed, they turn to a diatomite. Diatomaceous earth is significant as a pest repellant because of its hygroscopic property and has very abrasive particle hence it absorbs the water-protective fats and oils from the outermost layer of insects.