Cigarette smoking decreases speed in track runner, due to the fact that their lungs have black spots. Making it harder for them to breathe. And harder to breathe causing slowing in speed.
Answer:
Lichens are not purely mutualistic relationships.
Explanation:
Dna and rna have different sugars that make them up their structure is also different dna is a double helix while rna is just a string therefore thay go through different proccess of breaking down
