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The changes you might observe in the fossil record that would indicate the occurrence of a mass extinction is the <span>disappearance and subsequent absence of many up till then long-established groups.</span>
<span>Cyanobacteria is the answer to your question</span>
Answer:
Carbon Dioxide
Explanation:
Snails will produce only carbon dioxide, while the Elodea will produce carbon dioxide and oxygen gas. Snails and Elodea will produce more carbon dioxide, causing the water to turn yellow.
Answer:
A positive feedback loop.
Explanation:
In the example given in the question, there's a cause and effect relationship between Dawn's drinking/smoking and the baby's reactions. It can be clearly seen that the consequence of the drinking/smoking action in turn increases the amount of said action through a positive feedback loop.
I hope this answer was helpful.