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antoniya [11.8K]
3 years ago
12

Question 15 of 20:

Biology
1 answer:
11Alexandr11 [23.1K]3 years ago
5 0

Answer:  b

Explanation:

An open system is when nutrients and waste are moved through the body   freely through the body cavity, rather than being enclosed in veins.

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When scientists studied patterns in the rocks of the ocean floor, they found more support for sea-floor spreading. You read earlier that Earth behaves like a giant magnet, with a north pole and a south pole. Surprisingly, Earth’s magnetic poles have reversed themselves many times during Earth’s history. The last reversal happened 780,000 years ago. If the magnetic poles suddenly reversed themselves today, you would find that your compass needle points south.

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