# Science

Science

A species is a group of living organisms comprised of members capable of sharing a gene pool or interbreeding. This implies that members of the same species have similar characteristics and are...

Latest answer posted August 12, 2020, 1:31 pm (UTC)

Science

Generally speaking this is true, although it would be more practical to round down the timeframe to "thousands of years" rather than millions, because most of the nebulae we observe are located in...

Latest answer posted August 1, 2016, 1:15 am (UTC)

Science

Puberty in females usually occurs around eleven years of age, however, it may occur younger or older depending on factors like heredity, diet and hormones. If a girl as young as eight goes through...

Latest answer posted November 23, 2010, 9:43 am (UTC)

Science

When the YO decomposes, it will produce one mole of Y for every mole of YO and 1/2 mole of O2 for every mole of YO. Since there are 22,400 cc of a gas in one mole, then in this case there are...

Latest answer posted December 9, 2010, 6:46 am (UTC)

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Economic costs will be incredibly large. Not only are they losing money from the loss of oil itself but they are losing money in the cleanup process as well. They are going to have to pay millions...

Latest answer posted May 20, 2010, 11:45 am (UTC)

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The four main functions of epithelial tissue are to provide physical protection, control permeablility, provide sensations, and to produce specailized secretions. There are eight types of...

Latest answer posted October 9, 2009, 1:46 am (UTC)

Science

We are differentiating between metamorphic and sedimentary rocks. There are three major types of rock: igneous, metamorphic, and sedimentary. Igneous rocks are formed by the cooling of hot lava....

Latest answer posted October 23, 2012, 3:06 am (UTC)

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Luminous flux is also known as luminous power. It is the amount of perceived light emitted. This distinguishes it from radiant flux, which is all the electromagnetic radiation emitted. Radiant flux...

Latest answer posted June 17, 2021, 2:56 pm (UTC)

Science

The population of Noblesville, Indiana (according to the United States Census Bureau) was 57,584 in the year 2014. In comparison, the population of the city was 52,135 in 2010, representing a...

Latest answer posted January 9, 2016, 1:31 pm (UTC)

Science

Archiannelida is also called Haprodrili. Two different zoologists gave it different names at roughly the same time and both names stuck. It is a form of marine worm in the phylum Annelid....

Latest answer posted May 28, 2013, 6:06 pm (UTC)

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Thermal expansion occurs to some degree in all substances. The density of liquids typically decreases as temperature increases, with most liquids having the highest density near their freezing...

Latest answer posted January 11, 2016, 6:19 pm (UTC)

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The water in the oceans is not stagnant (meaning, they circulate). Therefore, the currents which run through the ocean, in particular the Atlantic Ocean since your question specifically mentions...

Latest answer posted January 24, 2012, 8:19 am (UTC)

Science

Dating back to 460-377 BC, Hippocrates left records of the use of powder made from the bark and leaves of the willow tree. Salicylic acid is the active ingredient in aspirin, an analgesic, fever...

Latest answer posted December 3, 2012, 6:27 pm (UTC)

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Living things need nitrogen to synthesize proteins, an organic compound found in structural parts of cells and in enzymes and hormones. Atmospheric nitrogen gas cannot be used by most living...

Latest answer posted January 31, 2012, 7:52 pm (UTC)

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Activated charcoal is commonly given for acute overdose if the time of ingestion is less than two hours. Theoretically, the charcoal binds the substance (pills, medications) in the gastric mucosa...

Latest answer posted July 20, 2010, 5:08 pm (UTC)

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Acid rain reduces the pH of green plants. Reduced pH changes the chemical make-up of the plants. Chlorophyll production is diminished, and the plant's roots become less efficient at absorbing...

Latest answer posted January 25, 2013, 12:43 am (UTC)

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Allergic reactions can range from the slightest irritation, whether on the skin or in the stomach, esophagus, etc., all the way to violent and horrible death, all of it depending on the person, the...

Latest answer posted July 27, 2010, 11:41 pm (UTC)

Science

DNA stands for deoxyribonucleic acid while RNA stands for ribonucleic acid. Each of these nucleic acids is made up of the monomer nucleotides. A nucleotide consists of a sugar, a phosphate groupe...

Latest answer posted December 9, 2009, 1:07 am (UTC)

Science

A mole of any material contains 6.023 x 10^23 atoms. The number 6.023 x 10^23 is also known as the Avogadro's number. Thus 1 mole of an element will contain an Avogadro's number (or 6.023 x 10^23)...

Latest answer posted October 5, 2015, 12:35 am (UTC)

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There are many, many enzymes in the human body that are designed for repairing specific types of DNA damage. Damage to DNA can come in many different forms. UV radiation can cause base pairs to...

Latest answer posted October 12, 2013, 11:21 pm (UTC)

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A white hole is the hypothetical "exit" to a black hole. Black holes are the remains of dead stars that have imploded upon themselves. The material is so dense, it generates a tremendous...

Latest answer posted April 14, 2012, 3:44 pm (UTC)

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The boat is initially sailing due North as indicated by a compass and the Earth's magnetic field is 2.0*10^-5 T. A radio is placed above the compass. There is a current carrying wire in the radio...

Latest answer posted April 20, 2012, 3:37 pm (UTC)

Science

Not all dogs react the same way to intrusions in territory. Many dogs are submissive and don't really seem to care who comes near them. Territorial aggression can also be affected by a dog's age...

Latest answer posted February 23, 2012, 10:21 am (UTC)

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Charles Darwin first explained the theory of evolution and the process of natural selection. Much like his grandfather Erasmus Darwin, Charles had an inquisitive and scientific mind, but he was not...

Latest answer posted March 25, 2014, 10:03 pm (UTC)

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A. The energy equivalent to matter with mass m is given by the equation E = m*c^2 where c is the speed of light. The fusion reaction in the Sun consumes 3.6*10^9 kg of matter each second. The...

Latest answer posted September 15, 2014, 12:24 am (UTC)

Science

Ultimately, we are all alone. Each of us has relationships with other human beings, but we are still alone in our heads. Since we have no idea what is beyond the small parts of space that we can...

Latest answer posted May 5, 2012, 4:01 am (UTC)

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Crude is a 2009 documentary about an Ecuadorian oil pollution crisis allegedly perpetrated by Chevron and Texaco. As a result of the ongoing crisis, a class-action lawsuit was filed against...

Latest answer posted July 26, 2016, 12:58 am (UTC)

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Matter can be found in various states--solid, liquid and gas. When ice, a solid, gains heat, it becomes a liquid. As liquid water gains heat, at 100 degrees Celsius, some atoms become water...

Latest answer posted August 24, 2012, 10:08 pm (UTC)

Science

Here we have a redox reaction. MnO_4^(-) is reduced to Mn^(2+) and NO_2^(-) to NO_3^(-) . MnO_4^(-)+8H^+ +5e rarr Mn^(2+)+4H_2O ----(1) NO_2^(-)+H_2O rarr NO_3^(-)+2H^++2e -----(2)...

Latest answer posted September 6, 2012, 2:51 am (UTC)

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There is more than one reason. Sickle-cell Anemia is an example where natural selection made it more prevalent than it would naturally be. Normal blood cells are caused by a gene that has...

Latest answer posted April 29, 2013, 4:21 am (UTC)

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I see where you are coming from with this question. When a strong base like sodium hydroxide reacts with a strong acid like hydrochloric acid, the end result is an ionic salt like sodium chloride...

Latest answer posted October 17, 2012, 11:57 pm (UTC)

Science

Chromium is an element. Objects are not normally made of chromium, but may be Chrome plated (covered with a thin layer of Chromium). Chrome plating requires high concentrations of Chromic Acid, a...

Latest answer posted December 20, 2011, 8:21 am (UTC)

Science

As the question indicates, an atrial septal defect is commonly called a "hole in the heart." Conveniently, the medical name of the defect tells people where the defect is. The septum is the wall...

Latest answer posted March 20, 2020, 2:57 pm (UTC)

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Aspirin works by blocking the cyclooxygenase enzyme COX-1. It acts as an irreversible inhibitor of the enzyme by adding an acetyl group to the active site. This is an irreversible reaction,...

Latest answer posted December 5, 2012, 3:23 am (UTC)

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Modern biologists, expanding on the work of Charles Darwin, believe evolution to be a mechanism by which species change over time. There is no evidence that the genes or characteristics of the...

Latest answer posted February 27, 2012, 8:35 am (UTC)

Science

The kinetic energy of an object is the energy it possesses due to the fact that it is in motion. For an object weighing m and moving at a velocity v, the kinetic energy is given by KE =...

Latest answer posted March 3, 2012, 9:45 pm (UTC)

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This is an amazing article! It really shows all the work CSI puts into their work. It could easily be used to show all the different aspects of an investigator's job for students to understand what...

Latest answer posted September 7, 2013, 8:06 pm (UTC)

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While genetics looks at specific genes—usually to identify abnormalities in the code—genomics refers to the study of a person’s complete genetic makeup. Genomic technology and science hold the...

Latest answer posted May 29, 2020, 11:22 pm (UTC)

Science

Direct current is the original electrical current that was produced when Thomas Edison went into business with the Edison Light and Electrical Company. It worked just fine except for one thing:...

Latest answer posted April 6, 2012, 3:17 am (UTC)

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A blood culture is a test that may be ordered by a doctor when it is suspected that someone has an infection caused by either a bacteria or a fungus. The circulatory system is one of the few places...

Latest answer posted February 5, 2016, 2:36 am (UTC)

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Fungi may look like plants. They are usually green, and can have parts that look like stems and leaves. However, as others have mentioned they are part of another kingdom and they get their...

Latest answer posted February 23, 2012, 9:51 am (UTC)

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You can find this information on the US Geological survey website, posted as my first link below. When you ask for "geography" of each type of mountain, it may sound like you are asking just for...

Latest answer posted February 14, 2010, 12:52 am (UTC)

Science

I think you are asking if we could stay alive in a black hole if we did not stay very long. I would say no. Some scientists do think that we will eventually be able to travel through time, or...

Latest answer posted November 8, 2012, 3:47 pm (UTC)

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Based on my knowledge of the antibiotic doxycycline and its basic pharmacodynamics, it doesn't appear to be a contradiction. Upregulation is the term for a persistent increase in a cell or bodily...

Latest answer posted October 16, 2018, 9:08 pm (UTC)

Science

Usually. Cats have an innate ability to orient themselves in mid-air so that they land on their feet. This is called the righting reflex. The longer the fall, the more likely a cat is to land on...

Latest answer posted November 1, 2015, 5:39 am (UTC)

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Force is a vector that has both a magnitude and a direction. Similarly, displacement is also a vector. Work is the dot product or scalar product of the vectors representing force and displacement....

Latest answer posted October 23, 2011, 10:13 pm (UTC)

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Sustainable development, in simple terms, means development in a sustainable manner. That is, the development is carried out in such a manner that the current needs are satisfied and the needs of...

Latest answer posted March 11, 2016, 8:56 am (UTC)

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Pure substances are defined as a particle that is made up only one type of particle. Examples of pure substances are atoms, elements, compounds, and molecules. Atoms are the smallest unit of all...

Latest answer posted November 18, 2015, 1:38 pm (UTC)

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Hello! Adenosine diphosphate (ADP) is a molecule that is a source of energy. But it is less than what ATP can give. ATP is adenosine triphosphate. It is being produced when the cell, primarily at...

Latest answer posted September 27, 2012, 11:23 pm (UTC)