Answer: The upper chamber is called an atrium, or auricle, and the lower chamber is called a ventricle. The two atria act as receiving chambers for blood entering the heart; the more muscular ventricles pump the blood out of the heart.
Answer:
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Explanation:
Answer: carbohydrates are formed glucose and are hydrolysed in stomach and used
As energy in cells.
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B
creates something new its the start of succession.
2: Amount of precipitation, average temperature
3: Desert
4: The tundra
5: All of the above
