A respirometer is used to indirectly measure basal metabolic rate by measuring _____________ consumption at different temperatures.

The chemical element with the atomic number 8 and symbol O is called oxygen.
It belongs to the periodic table's chalcogen group, is a very reactive nonmetal, and an oxidising agent that easily produces oxides with most elements as well as other compounds.
After hydrogen and helium, oxygen is the third most plentiful element in the universe and the most abundant element on Earth.

Temperature is a numerical expression of how hot a substance or radiation is.
There are three different types of temperature scales: those that are defined by the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron in a body, like the SI scale; those that rely only on macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are defined by practical empirical properties of particula rather than theoretical principles.

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