Answer:
Haemoglobin carries oxygen, therefore, more oxygen can be transported to cells such as muscle cells. More oxygen transported to cells results in more aerobic respiration of cells such as muscle cells.
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As the star runs out of nuclear fuel, some of its mass flows into its core. Eventually, the core is so heavy that it cannot withstand its own gravitational force. The core collapses, which results in the giant explosion of a supernova. The sun is a single star, but it does not have enough mass to become a supernova.
