Explain the importance of the blood returning to the heart twice in one cycle​

Explanation:

It is called a double circulatory system because blood passes through the heart twice per circuit. The right pump sends deoxygenated blood to the lungs where it becomes oxygenated and returns back to the heart. The left pump sends the newly oxygenated blood around the body.

since most straws are made of plastic, they are hard to be broken down, even by the forces of nature.   sometimes, this trash can end up at sea and can cause sea turtles to choke upon this when initially perceived that the straw is a source of food.

explanation:

mark for : d !

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answer; i believe the correct answer is (data); /// good luck