Science Questions and Answers

Science

Lichens are a type of fungus that live in a mutual relationship with algae and cyanobacteria. There are approximately 20,000 species of lichens, and lichens can vary in appearance, appearing in...

Latest answer posted July 28, 2020, 11:00 am (UTC)

1 educator answer

Science

This question is interesting. I'll try my hand at suggesting some possibilities, but I'm no scientist! I'm not sure if you have in mind a jar that's sealed shut and filled entirely with water or...

Latest answer posted March 5, 2010, 10:49 am (UTC)

1 educator answer

Science

Eyeglass lenses were used to form the first-ever telescopes. However, there is actually some controversy over who invented the first telescope and where and when they invented it. The standard...

Latest answer posted September 29, 2018, 11:47 am (UTC)

2 educator answers

Science

Fish do not have a pelvic girdle. If you mean aquatic mammals like a blue whale, they do have pelvic girdles which no longer serve a purpose. Any organ (like this unused pelvis) is referred to as...

Latest answer posted August 22, 2009, 3:46 pm (UTC)

1 educator answer

Science

There are two types of bone marrow: red marrow and yellow marrow. Yellow marrow is mostly fat, but red marrow is very metabolically active. Red marrow does the process of hematopoiesis, which...

Latest answer posted October 4, 2011, 3:18 am (UTC)

1 educator answer

Science

When hand raising a baby bird you can take several peices of dog or cat food and add enough water to turn it into a paste. Using a straw cut to a beak like shape, scoop some of the paste on the...

Latest answer posted May 25, 2009, 3:32 am (UTC)

1 educator answer

Science

Dark matter is thought to make up 90 percent of the universe. It cannot absorb light and it cannot give off light so it considered to be invisible. It is thought to exist because of gravitational...

Latest answer posted March 27, 2010, 4:16 am (UTC)

1 educator answer

Science

Time is usually the constant, and would be on the x axis. Things can travel a different distance in the same amount of time depending on a variety of factors you might be measuring in the...

Latest answer posted June 2, 2009, 4:58 am (UTC)

1 educator answer

Science

When Thorium-240 decays to radium-226 it emits an alpha particle and loses 4 mass units. 15 grams of radium-226 resulted from the decay of this amount of thorium-230: (15g)(230/226) = 15.26 g Since...

Latest answer posted February 3, 2016, 3:38 am (UTC)

1 educator answer

Science

Doctors can perform a strep throat culture on an individual to see if the person has it. How it is done is the doctor takes a swab and scrapes the infected area in the throat, usually on the...

Latest answer posted April 10, 2010, 5:52 am (UTC)

1 educator answer

Science

Note that a freely falling object has a constant acceleration which is equal to gravity. Its sign varies depending on the object's direction. When going up, acceleration is positive and negative if...

Latest answer posted August 26, 2012, 6:56 am (UTC)

1 educator answer

Science

The Cambrian is the first geological period of the Paleozoic Era. The Cambrian is unique in its high proportion of lagerstatten. Lagerstatten are geographic sites with large amounts of fossilized...

Latest answer posted April 23, 2010, 7:42 am (UTC)

1 educator answer

Science

`2K_3PO_4 + 3MgCl_2 --gtMg_3(PO_4)_2 + 6KCl` Mole ratio: `K_3PO_4:MgCl_2` = 2:3 Number of `MgCl_2` present in the solution = 0.75/1000*28mol...

Latest answer posted September 6, 2012, 2:01 am (UTC)

1 educator answer

Science

A potential cause for the egg's shell cracking would be the unequal expansion tendencies of the egg shell versus the interior of the egg. The interior of the egg would expand at a rate slightly...

Latest answer posted December 22, 2011, 11:19 am (UTC)

1 educator answer

Science

This is a very interesting question. The most effective thing we can do to reduce global warming would be to insure we have as many "green" plants growing as possible. There is a certain amount...

Latest answer posted January 21, 2012, 4:21 am (UTC)

1 educator answer

Science

Robert Brown was a Scottish biologist working in the beginning half of the 1800's. About 200 years before Robert Brown, Anton Van Leeuwenhoek invented the first microscope. Over the course of...

Latest answer posted September 24, 2015, 8:46 pm (UTC)

1 educator answer

Science

Overall, I think that levees are effective in being able to hold back water from communities and other areas. There has to be a continual examination and reexamination of levees because erosion...

Latest answer posted March 9, 2011, 7:03 pm (UTC)

1 educator answer

Science

Biodiversity means the amount of species in a given ecosystem or biome. A tropical rainforest has warmer temperatures, greater amount of insulation throughout the year and a constant supply of...

Latest answer posted April 10, 2011, 1:41 am (UTC)

1 educator answer

Science

To say that you are infected doesn't necessarily mean that you have active disease. You could harbor the causitive pathogen Mycobacteria tuberculosis in your body but not show signs and symptoms of...

Latest answer posted August 8, 2010, 2:45 pm (UTC)

3 educator answers

Science

Translation is the second half of protein synthesis. DNA is essentially a huge instruction manual on how to make each of the proteins that are needed to create the organism it belongs to. You can...

Latest answer posted January 20, 2009, 4:09 am (UTC)

2 educator answers

Science

A biopsy (Bx) is the surgical removal of tissue for the purposes of histological examination in the histology lab. The purpose of a biopsy of any tissue is to look for abnormalities. Breast tissue...

Latest answer posted August 11, 2010, 7:26 pm (UTC)

1 educator answer

Science

Bacteria is a classification of a germ that can cause diseases. There is harmful and helpful bacteria in the human body. Harmful bacteria can enter the body in a variety of ways and cause harm to...

Latest answer posted January 21, 2009, 3:41 am (UTC)

1 educator answer

Science

We actually cannot calculate the amounts of the gasses at equilibrium because the equililbrium constant for the reaction is not given. The equiilibrium constant tells us the ratio of amounts of...

Latest answer posted May 2, 2011, 2:22 am (UTC)

1 educator answer

Science

SANE is an acronym for sexual assault nurse examiner. In most jurisdictions a SANE nurse must first be a R.N. with three to four years of emergency care experience. SANE nurses receive specialized...

Latest answer posted August 27, 2010, 6:12 pm (UTC)

1 educator answer

Science

Whenever we are talking about gases, the first thing that always comes to my mind is the ideal gas law, PV = nRT. In this problem, we can look at the information we are given to see if that is a...

Latest answer posted March 19, 2012, 10:07 pm (UTC)

1 educator answer

Science

Examples from human needs are numerous: Weaponry, agriculture, and medicine are broad areas that have developed from human needs. The science of cancer research, for example, is driven by human...

Latest answer posted March 20, 2012, 2:05 am (UTC)

1 educator answer

Science

Secondary sexual characteristics are those observable traits that occur as a result of primary sexual characteristics, which are directly tied to the necessity of reproduction. In females,...

Latest answer posted March 24, 2012, 1:34 am (UTC)

1 educator answer

Science

Most tattoo ink is still permanent. Tattoo ink consists of both the ink pigment and a carrier agent. Tattooing has been practiced almost as long as humans have been around. However, in recent years...

Latest answer posted March 4, 2012, 4:36 am (UTC)

3 educator answers

Science

To solve, apply the formula of acceleration which is: `a=(v_f-v_i)/t` where a - acceleration `v_f` - final velocity `v_i ` - initial velocity t - time So, plug-in `v_i` =200 m/s, `v_f` =180...

Latest answer posted October 14, 2013, 6:12 am (UTC)

1 educator answer

Science

Although this is one explanation, I don't think it addresses all of the questions about the Bermuda Triangle. Some of the strange things that have happened do include ships and planes going down,...

Latest answer posted February 28, 2012, 1:23 pm (UTC)

5 educator answers

Science

Okay, lets start with the original gene. Genes are sections of amino acids, grouped together in threes to make a unit called a codon. These amino acids consist of a sugar, phosphate, and a base....

Latest answer posted April 15, 2012, 7:23 pm (UTC)

1 educator answer

Science

Dear Coastal Neighborhood Association, I write this letter today to communicate my concern over the decrease in the size of our beaches over the past several years. The shrinking of our beaches is...

Latest answer posted January 10, 2016, 7:00 pm (UTC)

1 educator answer

Science

Ascaris is a roundworm which is classified in the Phylum Nematoda, which is in the Animal Kingdom. Features of Nematode worms include bodies which are not segmented and appear smooth on the...

Latest answer posted January 31, 2016, 9:53 pm (UTC)

1 educator answer

Science

The Principle of Homogeneity of Dimensions states that all terms inside a physical formula must be the same. Really, it is a bad idea to add meters to kilograms (multiplying meters by kilograms is...

Latest answer posted June 17, 2016, 8:43 am (UTC)

1 educator answer

Science

What is known is that the space between Galexies is expanding. Gravity is strong enough to hold the galexy groups, galexies, stars, solar systems, and planets together, but in between galexy...

Latest answer posted September 11, 2011, 3:03 pm (UTC)

1 educator answer

Science

First, let's write the balanced equation for the formation of water from hydrogen and oxygen. 2H[2]+O[2]->2 H[2]O This equation indicates that two parts of H2 and one part of O2 are needed to...

Latest answer posted January 24, 2016, 11:20 pm (UTC)

1 educator answer

Science

The easiest way to test the effectiveness of a particular preservative would be to add this item to its intended food product and wait. The preservative would be considered effective if it kept...

Latest answer posted September 19, 2011, 11:15 pm (UTC)

1 educator answer

Science

The basic principle behind this problem is for the weight of the oil and the weight of the water to be equal. When the weights are equal, the liquids are in static equilibrium and stop moving up...

Latest answer posted September 28, 2011, 10:56 am (UTC)

1 educator answer

Science

Hello! There is at least one metal with this property, plutonium (Pu). It is a radioactive element used in nuclear weapons and as an energy source in peace applications. As a substance, without...

Latest answer posted November 20, 2015, 2:09 pm (UTC)

1 educator answer

Science

The force that curves the trajectory of a charged particle `q` in a magnetic field of intensity `B` is the Lorentz force: `|F|=|q*(v xx B)| =qvB` if vector speed `v` is perpendicular to vector...

Latest answer posted October 24, 2013, 9:06 am (UTC)

1 educator answer

Science

`Zn+H_2SO_4 rarr H_2+ZnSO_4` Mole ratio `H_2:H_2SO_4 = 1:1` Volume of 1 mol of `H_2` at STP = 22.4L Amount of moles in 525ml of `H_2` at STP ` ` `= 1/22.4*(0.525) ` `= 0.0234` So we have...

Latest answer posted April 9, 2013, 12:20 am (UTC)

1 educator answer

Science

The potential energy stored in a spring that is either compressed or pulled to change its length from the equilibrium length by x is given as PE=(1/2)*k*x^2 where k is the spring constant. When a...

Latest answer posted November 30, 2011, 4:18 pm (UTC)

1 educator answer

Science

Teenagers experience rapid changes in their bodies and health choices they make at this age can have long-lasting effects throughout their life. The physical growth plus hormone changes create a...

Latest answer posted April 23, 2013, 6:05 pm (UTC)

1 educator answer

Science

A scalar quantity is one which is described by its magnitude. It has no direction or it does not require a direction for its complete description. The speed of a body is an example of a scalar...

Latest answer posted May 6, 2016, 1:19 pm (UTC)

1 educator answer

Science

Protein biosynthesis can be broken down into two major phases, transcription and translation. Transcription is the first part. The DNA in the nucleus unwinds and a portion of the double helix...

Latest answer posted October 17, 2012, 12:01 am (UTC)

1 educator answer

Science

Since the original height of the tpendulum is h=10 cm = 0.1 m, and the new height is H=30 cm = 0.3 m, the change in potential energy of the pendulum is `Delta U = mg(H-h)` . This change, according...

Latest answer posted July 25, 2013, 2:06 am (UTC)

1 educator answer

Science

Molality is the ratio between amount of substance of solute in moles and amount of solvent in kg. Molality (M) = (moles of solute)/(mass of solvent) Here the solute is NaCl and solvent is water....

Latest answer posted January 30, 2013, 4:21 am (UTC)

1 educator answer

Science

One thing that will be weird and incorrect is that there will be no physicality. In the physical world, accidents happen: people fumble things, mismeasure things, get distracted and break things....

Latest answer posted August 22, 2013, 10:07 pm (UTC)

1 educator answer

Science

Orchids are really amazing plants. I can see the symbiotic relationship here between the crickets and the flowers. This happens all throughout nature. I think that there might have been...

Latest answer posted March 1, 2012, 3:56 pm (UTC)

3 educator answers

Science

To fill a cylinder that has a volume of 100 cm^3, the student requires 180 drops. The volume of each drop is equal to 100/180 cm^3 100/180 = 5/9 = 0.556 (approximately) The volume of each drop is...

Latest answer posted June 26, 2011, 9:55 pm (UTC)

1 educator answer

Showing 19751-19800 of 20415