respitory systym and circulatory system because you need your lungs to breathe and the blood and heart to pump the oxygen into the blood. :))
Answer:
Circulatory system
Explanation:
It can carry energy and oxygen to cell as well as waste out of cell example carbondioxide
<span>the correct answer is a.)317 ppm</span><span>
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A is your answer.
Water containing no salt is known as isotonic solution
Bacteria are classified into five groups according to their basic shapes: spherical (cocci), rod (bacilli), spiral (spirilla), comma (vibrios) or corkscrew (spirochaetes). They can exist as single cells, in pairs, chains or clusters. Bacteria are found in every habitat on Earth: soil, rock, oceans and even arctic snow.
