lactic acid
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When oxygen is scarce, cellular pyruvic acid will be converted to lactic acid through a process called lactic acid fermentation. This process helps regenerate NAD+ to keep glycolysis running in the absence of oxygen.
Anaerobic respiration is a process that does not use oxygen. It involves the breakdown of glucose to produce energy without the need for oxygen as the final electron acceptor. This process typically occurs in environments where oxygen is scarce.
Helium makes up about 0.0005% of the Earth's atmosphere, making it relatively scarce compared to other gases like nitrogen and oxygen.
Chlorine is common and widely used in various industries such as water treatment, sanitation, and the production of chemicals. It is abundant in nature and is one of the most abundant chemical elements on Earth.
Diamonds are a scarce resource because they form under high pressure and temperature deep within the Earth's mantle. They require specific geological conditions to be created, making their availability limited. Additionally, the mining and production of diamonds is tightly controlled to maintain their value and scarcity in the market.
Having a small amount of something is called "scarce" or "limited."