What was the greatest stumbling block for scientists understanding of the star at the Sun?

1 answer:

6 0

The greatest stumbling block for scientists understanding of the star at the Sun is how the Sun could ever have maintained its tremendous heat output for more than 20 million years.

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What does the sign pictured above mean?

MakcuM [25]

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What kind of cancers are common among people living with aids?

Anastasy [175]

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WILL GIVE BRAINLIEST!!! :)

elena-s [515]

I believe the answer is B. They were no longer able to acquire the necessary characteristics for survival in a changing environment. I think it is B. because trilobites mostly went extinct because of the event that wiped out 95% of Earth's species. So they didn't have the characteristics to survive. Hope I helped!

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Crossing-over allows the reassortment of linked genes. <br> a. True <br> b. False

Irina18 [472]

True

Crossing over involves homologous chromosome pairs "crossing over" and exchanging genetic information.

I have attached an image that might help you understand the concept a bit better.

I hope this helps! I'm happy to answer any other questions you might have :)

[Image sourced from: http://www.qsstudy.com/biology/define-crossing-importance]

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3 years ago