Catalase enzymes cause hydrogen peroxide to break down, this forms water and oxygen. In other words, it will bubble; the bubbles are oxygen gas.
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External Respiration takes place in the Trachea. When oxygen and co2 "switch" its where they connect and making this external respiration!
I hope this helps you!
Radon gas is a radioactive product of the decay of naturally occurring uranium<span> in the Earth's crust. Groundwater entering a house through a home water-supply system might release radon indoors where it could be breathed.</span><span>
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Bronze casting was the technology developed during the Shang Dynasty. This method of moulding bronze is used to create bronze sculptures, figurines, and also weapons. The technology is a very important achievement to the dynasty itself because of its use in warfare and defense.