The most common tree in that continent is one that's named "floss silk". It's classified as a tropical tree so we could say that most of South America is covered in tropical trees.
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For a fish to be buoyant, or float, it must displace less water or the same amount of water as its own body mass. ... Many fish use swim bladders to help them with quick depth changes. These bladders fill with air to help fish rise or release air so fish can sink, often in conjunction with forward movement.
The answer is B
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