[Solved] As a rule, as a consumer acquires more and more of a good, the marginal utility declines. Ocean Anoxia: A condition in oceanic environments where there is a severe deficiency or absence of oxygen, potentially leading to mass extinctions or significant ecosystem changes. Silicoclastic Rock: Sedimentary rocks composed mostly of silicate minerals, formed from the accumulation of clastic sediments. Microscopic Organisms: Living beings that are too small to be seen with the naked eye, including bacteria, viruses, fungi, and protozoa, playing essential roles in ecosystems and human health. Siberian Traps: A large region of volcanic rock in Siberia, known for one of the largest volcanic events in Earth's history, linked to the mass extinction at the end of the Permian period.