What are the spiral arms of the Milky Way made of? A. Older stars and comets
B. Variable stars
C. Asteroids and comets
D. Younger stars and gaseous nebulae

Answers

Answer 1
Answer: The spiral arms of the Milky Way are made of younger stars and gaseous nebulae. There are four spiral arms within the Milky Way galactic disc that start at the galaxy's center. The sun is five to 30 parsecs away from the center of the galactic disk.
Answer 2
Answer:

younger stars and gaseous nebulae d is the corrcet answer


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Which of the following statements about rural communities is true? a. Rural communities can support any population size. b. More people in the United States live in rural communities than they did in 1900. c. Rural communities were built based on the location of available resources. d. People in developed countries are moving back to rural communities...

According to classification, if two organisms are in the same class, then they must be in the same kingdom and

Answers

SPECIES I GUESS SOMETHING LIKE THAT

Answer:

phylum

Explanation:

Which statement accurately describes the relationship between the brain and addiction?A. Normal activities produce heightened responses once receptors are reduced.   B. A higher amount of addictive chemicals are needed to get the same high when fewer receptors are present.   C. The brain reacts to excessive dopamine levels by increasing the number of dopamine receptors.   D. All drugs act on dopamine synapses in the same way.

Answers

 C. The brain reacts to excessive dopamine levels by increasing the number of dopamine receptors. 

The statement accurately describes the relationship between the brain and addiction. There is a significant link between neurotransmitters and its influence on the activity and the emotion that we feel towards that set of activity. When there is an abnormal or disoriented amount of neuro-chemicals then it would cause some dysfunctional responses on the activity. 

Write a short story (one page) in which an earthquake occurs or a volcano erupts. What do your characters do? How do they react? What caused the earthquake or eruption?pls help me

Answers

Answer:

An earthquake is caused by a sudden slip on a fault. The tectonic plates are always slowly moving, but they get stuck at their edges due to friction. When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust and cause the shaking that we feel.

In California there are two plates - the Pacific Plate and the North American Plate. The Pacific Plate consists of most of the Pacific Ocean floor and the California Coast line. The North American Plate comprises most the North American Continent and parts of the Atlantic Ocean floor. The primary boundary between these two plates is the San Andreas Fault. The San Andreas Fault is more than 650 miles long and extends to depths of at least 10 miles. Many other smaller faults like the Hayward (Northern California) and the San Jacinto (Southern California) branch from and join the San Andreas Fault Zone.

The Pacific Plate grinds northwestward past the North American Plate at a rate of about two inches per year. Parts of the San Andreas Fault system adapt to this movement by constant "creep" resulting in many tiny shocks and a few moderate earth tremors. In other areas where creep is NOT constant, strain can build up for hundreds of years, producing great earthquakes when it finally releases.

Groundwater is in danger partially due toA. sinkhole formation.

B. the building of dams.

C. a slow recharge rate.

D. infiltration by acidic water.

Answers

Answer: Option A) sinkhole formation.

Explanation:

A sinkhole refers to any dug-out or depressed area of land where human

or animal waste (excreta) are deposited.

Now, since these wastes contains water and are biodegradable by microorganisms, the fecal matter could be infected and in turns infect groundwater.

The contaminated-groundwater poses danger due to disease-causing organisms like

- vibrio cholerae, causing cholera

- Salmonella typhi, causing typhoid outbreak present, and also reduces volume of suitable drinking water in the community

Thus, the answer is sinkhole formation

What are the final electron acceptor in electron transport chain?

Answers


In aerobic respiration, the final electron acceptor in the electron transport chain  is oxygen.  It accepts two electrons and a molecule of water is formed as a by product.

In anaerobic respiration, the final electron acceptor in the electron transport chain is pyruvate.  Anaerobic respiration  commonly occurs in the muscle tissue of animals as  a result of intense activity or exertion. Pyruvate is used as makeshift electron acceptor in place of oxygen and is reduced or converted to lactic acid.



Final answer:

In the electron transport chain involved in aerobic respiration, oxygen plays the essential role of final electron acceptor. It receives low-energy electrons and forms water, allowing the process to continue and ATP to be produced. This chain also allows for the creation of various other biochemical molecules.

Explanation:

The final electron acceptor in the electron transport chain, which is a part of aerobic respiration, is oxygen. As electrons are passed down the electron transport chain, from NADH or FADH₂, they lose energy. This journey through a series of redox reactions creates an electrochemical gradient used in chemiosmosis, contributing to the production of ATP.

Oxygen is the final receiver of these low-energy electrons. In combination with hydrogen ions, it forms water, which is one of the end products of the electron transport chain. Consequently, the presence of oxygen is crucial for the functioning of the electron transport chain and the production of ATP, our body's primary energy currency.

ATP generation is only one of the many functions of the electron transport chain. Other biochemical molecules, such as nonessential amino acids, sugars and lipids, can also be produced from intermediate compounds of glucose catabolism. These molecules, in turn, can serve as energy sources for glucose pathways.

Learn more about Electron Transport Chain here:

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How does rust make steel weak?

Answers

The reddish-brown flakes we found in metals are called rust. Rust are iron oxide. It is the product when an iron reacts with oxygen. Which is why metals rust when exposed to air and water. The process is called corrosion. By then metals get weaker because the strong irons are replaced with iron oxides which are flaky powder.