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2 years ago

How do the main sequence stages of these two sizes of stars differ?

1 answer:

5 0

Stellar evolution is the process by which a star undergoes a sequence of radical changes during its lifetime. Depending on the mass of the star, this lifetime ranges from only a few million years (for the most massive) to trillions of years (for the less massive), considerably more than the age of the universe. ^

Small, relatively cold, low mass red dwarfs burn hydrogen slowly and will burn for hundreds of billions of years

Massive hot supergiants will live for just a few million years.

A mid-sized star like the Sun will remain on the main sequence for about 10 billion years. Hope tis helps!!

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Simulations are useful for understanding how natural processes work but are not always representative of the real world. How doe

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The ecosystem is very complex and simulations do not include all of the factors that may impact ecosystem processes.

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2 years ago

Like all cells, the neurons' internal organization dictates its function. Neurons have relatively many mitochondria, an extensiv

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Answer:

B is the answer

Explanation:

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2 years ago

Visit this website about public health issues. Scroll to the bottom of the page under "What is the impact of Public Health", and

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Part A: Influenza virus

Part B: Influenza is a public health issue because it is one of the leading cause of death all over the world. Proper vaccination against the illness can prevent death and other serious illness due to this virus.

Part C: serious illness and death, mainly among children and elderly

Part D: Efforts are underway to create a cheap and effective vaccine against this virus. The National Vaccine Program Office is responsible for coordinating and ensuring collaboration among federal agencies involved in vaccine and immunization activities.

Part E: A vaccine against this virus will prevent people from facing the effects of this virus. Also, compulsorily vaccinations against this virus will ensure a major reduction in deaths caused by it.

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2 years ago

Which of the following conclusions is most clearly supported by the representations of nucleic acid #1 and nucleic acid #2 ? Nuc

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Answer:

This question is incomplete

Explanation:

This question is incomplete but the keys words in the question provides an idea of what the completed question is.

There are two types of nucleic acid; ribonucleic acid (RNA) and deoxyribonucleic acid (DNA).

They are both made up of ribose/pentose sugar, nitrogenous base and phosphate group.

The ribose sugar of the DNA is one oxygen less than the ribose sugar of the RNA hence the reason for the name "deoxyribose".

There are five nitrogenous bases namely; adenine, thymine, guanine, cytosine and uracil. They both contain adenine, guanine and cytosine; however, the DNA contains thymine while the RNA contains uracil. Of the five bases, adenine and guanine are the purines (have a double ring structure) while the rest are pyrimidines (have a single ring structure).

The phosphate group here is negatively charged

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2 years ago

The formation of pyrimidine dimers results from which of the following?

umka2103 [35]

Answer:

exposure to ultraviolet radiation is a correct answer.

Explanation:

Ultraviolet light exposure results in the formation of pyrimidine dimers. Ultraviolet radiation damage the DNA by resulting in chemical changes.

Ultraviolet radiation is absorbed by the pyrimidine bases( cytosine and thymine in DNA) and result in the formation of covalent bonds between the succeeding bases.

The formation of the pyrimidine dimers results in the distortions of DNA helix and disrupt the base-pairing during the replication of DNA which results in a mutation.

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2 years ago