<u>Answer:</u>
Option (3)
The arms mostly contains old blue and blue-white stars
<u>Explanation:</u>
Spiral arms are the regions in stars extending from the middle of spiral galaxies and the barred spiral. Those long, thin areas look like a spiral and therefore give their name to spiral galaxies.
Spiral arms, though, include many young, blue stars, that render their arms so bright (due to the high mass density and the fast stellar forming rates).
During episode 7 of "Cosmos: A spacetime odyssey", Clare Patterson thanks the scientist who have come before him, among these, he mentions Charles Lyell and Michael Faraday.
Cosmos was a popular television science documentary series. Episode 7 titled "The Clean Room", explored the work of Clare Patterson and during said episode, as he awaits the sample from the spectrometer, Patterson proceeds to give thanks for the advancement of science by those who have come before him.
Patterson states that he wishes to give thanks to scientists who have come before him and proceeds to mention names such as:
- J. J. Thomson.
- Ernest Rutherford
- Harrison Brown
- Charles Lyell
- Michael Faraday
all of which were renowned scientists with great contributions to the knowledge we possess today. He ends the thank you by stating that they now know the age of the Earth and with a symbolic "We did it."
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2019 years have humans been on earth
<span>In Integumentary system blood vessels are found in dermis and the blood vessels contract when the body is cold.
Dermis and epidermis are layers of the skin, dermis is the thick layer of tissues and it is present under the epidermis layer.
When we feel cold, our body supplies the warm blood to the skin. When contraction of blood vessels occurs, it reduces the flow of warm blood and reduces the heat loss. When we feel hot, blood vessels dilate.</span>
The major food molecule in living organisms is a sugar called glucose. Most carbohydrates (sugars and starches) are converted into glucose before they are broken down in the cytosol to release energy. The series of steps where glucose is broken down to release energy begins with a metabolic pathway called glycolysis. Glycolysis is the "lysing" or cutting of glucose to release energy. The six carbon sugar, glucose, is cut in half and converted into two three carbon sugars called pyruvate. What happens next depends on the presence or absence of oxygen.
If oxygen is present, then glucose can be broken all the way down into carbon dioxide and water. This process is called aerobic respiration because it requires air (oxygen). In the absence of oxygen, the cell uses a process called anaerobic fermentation. or simply fermentation. Fermentation doesn't break the sugar down any further, it simply helps reset the system so that more sugar can be broken down.
Because aerobic respiration breaks the sugar all the way down, it releases much more energy than fermentation.
