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Oksi-84 [34.3K]
3 years ago
14

Which describes the foramen magnum?

Biology
2 answers:
Yakvenalex [24]3 years ago
8 0
Upper surface of the base of the skull.
Yuri [45]3 years ago
6 0
The foramen magnum is really important feature for bipedal mammals (basically, animals that walk on two feet). It's basically a whole in the base of the skull that allows the spinal cord to connect the lower body to the brain. Hope this helps!
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Answer:

20 million years

Explanation:

If we have a neutral mutation rate of one mutation per 5 million years, then the total of eight mutation between the two different species would be 20 million years. This is because both species will have 4 mutations in those 20 million years, so combined, both by 4, will have 8 mutations between them. So few mutations on so much time will result in two species that are very similar to each other even after 20 million years of evolution, even making them hardly distinguishable, especially if it comes to defining fossil records from them both. A nice example of this are the members of the felidae (cat) family, which are all very closely related, and are almost identical, thus making it extremely hard to distinguish two species of the same or similar size by their fossils.

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Fittoniya [83]

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For example, when dominant brown eyes are crossed with recessive blue eyes, in a heterozygous dominant allele results in brown eyes and masks the recessive blue eyes.

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