Answer:
Covering organs within trunk cavities
Lining trunk cavities
Explanation:
Serous membranes are layers of tissue that protect the organs. They prevent the organs from getting damage from friction which can occur as they rub against the cavity walls.
Serous membranes have two layers, the visceral layer and the parietal layer. The visceral layer covers the organs while the parietal layer covers or lines the cavity walls. In between these two layers, you will find a gap or cavity filled with serous fluid.
They cover organs like the heart, lungs, blood vessels (some of them at least), testes and other organs found in the abdominal cavity.
The important part of the text is the following:
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"Their most important non-carrion food is fish, which they catch by
swooping down and grabbing fish that are near the surface of the water."
We know here that in order to survive, the Bald Eagle needs access to the water - and this water cannot be frozen. So the less ice cover there is, the more food it can obtain!
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Bacteria are so successful because they reproduce asexually meaning that they can make more offsprings at a shorter amount of time. Because they reproduce asexually, if that one bacteria is resistant to a certain other organism, so will its offsprings.