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Mnenie [13.5K]
4 years ago
7

21. When did the Precambrian era end?

Biology
2 answers:
labwork [276]4 years ago
6 0

Answer: The Precambrian era ends abot 540 million years ago.

Explanation:

The Precambrian era is the first geologic era of the Earth, it initiates from the Earth's formation (4600 million years ago) and ends at the beginning of the Cambrian era (541 million years ago). It is the longest geologic era of the Earth.  

Masja [62]4 years ago
4 0

Answer: approximately 540 million years ago

Explanation:

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Explanation:

In order to solve this you just have to create a punnet square, where the parents are shown to both have brown and green coloured eyes genes, so it would be like this:

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As the instructions say that if any kid had one green allele that would be the dominant, only the Brown-Brown will show the fenotype, so there´s 1/4 chance to happen, or 25%, the other probability of having green eyes is 3/4 or 75%

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Espero que esto ayude

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