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natulia [17]
3 years ago
13

The double layer of fibrous tissue surrounding the heart is the

Biology
1 answer:
elena-14-01-66 [18.8K]3 years ago
7 0

The answer is, Pericardium.

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Freshwater is defined as having a low _______ concentration, usually less than 1%.
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Answer: salt

Freshwater is defined as having a low salt concentration, usually less than 1%.

Explanation:

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As blue whales migrate, they move between areas of high and low sunlight intensity. When they are in areas
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