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Tomtit [17]
2 years ago
5

Like chordates, all invertebrates have

Biology
1 answer:
kondor19780726 [428]2 years ago
8 0
They both have a spinal chord and a central nervous system.
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A quarter of the sample.

Explanation:

Let the quantity at the beginning be T. If the element has a half-life of 1,000 years, it means that after 1000 years, T/2 (which represents half the initial quantity available) would have decayed, remaining T/2.

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