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Because at the time of the first living thing we know that there was no free oxygen in the environment.

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13y ago

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What living thing does not need oxygen to live?

Anaerobic bacteria are living things that do not require oxygen to survive. These organisms can produce energy through other metabolic processes that do not involve oxygen, such as fermentation or using alternative electron acceptors.


What does living things need?

Every living thing needs oxygen.


Does water take in food?

Water is not a living thing - it does not require food. Water is a molecule made up of 2 hydrogens and one oxygen. It does not take in food.


What percentage of oxygen is there in a living thing?

In general, living organisms are composed of about 65-70% oxygen. This varies by species and organism, with some containing more or less oxygen depending on their biological functions and metabolic processes. Oxygen is crucial for sustaining life as it is used in cellular respiration to produce energy.


How do you define some thing living?

you find out if its living if its respiratory system has to do with oxygen


What is living and non living?

A living thing is something that needs water and oxygen a non living thing does not need those things it can live without it.:)


What make the mealworm a living thing?

A living thing is defined by the functions of life:responsivenessadaptabilitygrowthreproductionmovementmetabolismabsorptionrespirationexcretion


What is non - living?

A living thing is something that needs water and oxygen a non living thing does not need those things it can live without it.:)


What is a good sentence with oxygen in it?

Oxygen is something no living thing could live without!


Are water living thing?

Water is not a living thing. It's a the chemical compound H2O, which stands for Hydrogen two oxygen.


How trees depend on non living thing for survival?

because trees have oxygen and we use oxygen


How do living things respirate?

living thing respire by taking oxygen in and carbon dioxide out of the cell