<span>Air pollution is the presence of harmful substances in the earths atmosphere </span>
Lichens have been described as "dual organisms<span>" because they are symbiotic associations between two (or sometimes more) entirely different types of microorganism - a fungus (termed the mycobiont) a green alga or a cyanobacterium (termed the photobiont).
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Body b will have a force 4 times stronger than body a, causing body b to reverse the direction of body a
Answer: A
Explanation:
Because its the main difference between the 2