why do we need the nitrogen cycle

why do we need the nitrogen cycle

Animals receive the nitrogen that they need from the consumption of plants. When plants, animals, and other organisms die, decomposers return nitrogen to the soil. What effect do humans have on the nitrogen cycle? As mentioned above, humans use fertilizers on plants to get them to grow better; and nitrogen is a major component of most fertilizers. Is this a concern? It can be. Nitrogen additions, in excessive amounts, pollute our ecosystems. This can change the functioning of the ecosystem, and the communities that are supported by it. O). This gas is a strong greenhouse gas. (It is also used to make trips to your local dentist less stressful. ) The amount of nitrogen that is transported in rivers and groundwater has increased. This can accumulate in the final destination and can lead to

 why do we have an immune system

why do we have an immune system

Since people and animals routinely get sick, it is obvious that our immune system (which includes but isn't limited to antibodies) doesn't always protect against pathogens. There are many reasons for this, far too many to summarize here, but one common reason is that it takes several days for the adaptive part of the immune system (which includes antibodies, among other things) to gear up and control an infection. Therefore, early treatment with antibiotics can help limit an infection before the immune system is fully engaged. Pathogenic bacteria are often resistant to immunity in many ways as well; that's one of the adaptations that makes them pathogenic. That means that even later in an infection, antibiotics can supplement the immune response and help eliminate bacteria. Note that many

 why do the leaves change colour in autumn

why do the leaves change colour in autumn

as featured on weather. com The Splendor of Autumn Every autumn we revel in the beauty of the fall colors. The mixture of red, purple, orange and yellow is the result of chemical processes that take place in the tree as the seasons change from summer to winter. During the spring and summer the leaves have served as factories where most of the foods necessary for the tree's growth are manufactured. This food-making process takes place in the leaf in numerous cells containing chlorophyll, which gives the leaf its green color. This extraordinary chemical absorbs from sunlight the energy that is used in transforming carbon dioxide and water to carbohydrates, such as sugars and starch. Along with the green pigment are yellow to orange pigments, carotenes and xanthophyll pigments which, for

 why do we need to learn science

why do we need to learn science

Learn about the biological, chemical, physical and technological world Learn that the scientific understanding of the world is constantly changing due to continuing research and new technology (for example the current debate on global warming, climate change and stem cell research) Why Study Science? Students often ask the question why do we have to do Science? Science is compulsory in Years 7 - 10 and is offered as Biology, Chemistry, Earth and Environmental Science, Physics and Senior Science in Years 11 and 12 so that students can: Develop skills of planning and conducting investigations, gathering information, team work and evaluating their findings Act responsibly when using scientific equipment and applying scientific knowledge. Develop the confidence, knowledge and skills to find

 why do we have 28 days in february

why do we have 28 days in february

It wouldnБt be a St. PatrickБs Day celebration in the Windy City without 400,000 spectators crowding the banks of the Chicago River to БoohБ and БaahБ at its (temporarily) emerald green tinge. But how do officials turn the water green? First, a bit of history: The dyeing tradition became an annual thing nearly 60 years ago, in 1962, but its real origins go back even further. In the early days of his administration as Mayor of Chicago, Richard J. Daley was a man on a mission to develop the cityБs riverfront area. There was just one problem: The river itself was a sewage-filled. In order to get to the bottom of the cityБs pollution problem and pinpoint the exact places where waste was being discarded into the waterway (and by whom), Daley authorized the pouring of a special green dye into

 why do we need to celebrate christmas day

why do we need to celebrate christmas day

Of course, we all know that Christmas is a Christian festival that celebrates the birth of Christ and millions of Christians all over the world celebrate this. P However, even non-Christians are lured into the magic and excitement of this holiday, exchanging gifts, decorating homes with, trees and decorations,and even gathering around the table for a festive lunch or dinner. P The shops play Christmas music and everyone spends a little extra at Christmas for that special someone. Families have come to enjoy pulling crackers at the dinner table, opening presents and eating throughout the whole day and into the next, otherwise known as Boxing Day. P It has almost become fashionable in the West to take part in this celebrationPand for kids of all ages, Santa Claus cannot be denied to them.

 why is my poop watery and light brown

why is my poop watery and light brown

Find Answers to Your Questions about Tan Colored Stools with Our New 80 Page Book and Save Your Gallbladder! P Now Only $1. 99 Patients often ask us if tan colored stools are normal? The simple answer is no. In a healthy functioning digestive system, normal stools should be brown colored (similar to a milk chocolate candy bar), not tan colored stools. PStools derive their normal brown color from bile pigments. Bile is a detergent-like fluid made by the liver, and released by the gallbladder. P Bile emulsifies fat, breaking it down into smaller, more easily digestible globules so it can be absorbed into the body. You may be familiar with the process of emulsification that occurs when we use dish washing detergent to wash greasy dishes. Without detergent it's much more difficult to clean a

 why is a midsummer night's dream a comedy

why is a midsummer night's dream a comedy

Shakespeare's A Midsummer Night's Dream is one of his most popular and enduring comedic plays. As do most Elizabethan comedies, this play is a light-hearted romp through many types of humor, all ending happily in the final scene. Also common to this era, comedy is centered on marriage and relationships, and a happy ending means uniting the courting couples. High Comedy can also be called situational comedy, in which the source of humor is the situation of mistaken identity or miscommunication. Low Comedy involves silliness, inappropriateness, and sometimes references that can be taken as vulgar or sexual. Slapstick is physical humor - action rather than dialogue. Shakespearean Comedy is the fast-paced, witty banter we see in all of Shakespeare's comedic plays: clever dialogue and

 why does my cat squint one eye

why does my cat squint one eye

Last week I told you about that remarkably powerful communication tool known as. Another part of cat anatomy, your cat s eyes, also speak volumes, but unlike tail talk, eye talk is (usually) quite a bit subtler form of behavior. Here are some facts about my favorite feline looks and what they mean, as well as photos illustrating them. 1. Aren t I cute? Don t you want to pet me? Kittens are experts in this particular pseudo-bashful expression. It s as if they re born knowing that no human can possibly resist the urge to pet a cat who shoots us this gaze. 2. Pet me because I need love right now! SinвВad was an expert at this look, and she knew that if she looked at me with this glance, there was no way I d say no. 3. Pleased to meet you This friendly and outgoing cat at wore this

 why do old people sleep all the time

why do old people sleep all the time

My mom is 94 and she too spends a lot of time in bed. She says I feel good in bed!. She may have a mild dementia, that is memory problems, low interest, don t initiate much. She likes music but does not put any CD. Like Ruemando s mother, she would be much more active if she had her own personal trainer. I tend to think Fine! You like to be in bed; be in bed. I just want you to be happy. When I spend a week with her, I sew and do projects; she likes me to show her my progress regularly. She is a very nice mom. I love her so much. I told her playing cards between 7:00 and 9:00 pm is enough for me, OK? She goes to a center 3 days /week from 9:00 to 3:00. ...