BIOLOGY

3.The sun is the biggest star in the solar system and it sht ecenter of tha magnificius solar system.
===-They are related because of the sun. The sun make UV rays that impact in our skin obtaining vitamin D. This vitamin D make an important role in the maintenance of the bone health. Also the too much UB rays in our skin can cause a disease called skin cancer.=== ===-The kids have to got a ood protection. In schools they have to wear appropiate unirforms. Sport officials have toprovide instructions of solarprotection. THe kids have to wear hats and drink a lot of water.===

Teacher i find only the australian sun policies for schools.

**http://www.elmundo.es/elmundosalud/especiales/cancer/piel.html http://www.zonadiet.com/nutricion/vit-d.htm**

http://www.solarviews.com/eng/sun.htm
I**nvestigate about:**
 * Skin Cancer, Vitamins and the Sun. Determine how they are related and describe the terms of care for any person. Base your work on Australian sun policies. Deadline: Thursday, October 1st.**

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 * Reviewed by GL: Partially copied from:**

=Homework for 18th of August=

__Cofactor:__ A cofactor is a non-protein, heat and low molecular weight, necessary for the action of an enzyme.
== Properties: Cofactors can be divided into two broad groups: organic cofactors, such as flavin or heme, and inorganic cofactors: such as the metal ions Mg2+, Cu+, Mn2+ or iron-sulfur clusters. ==

__Enzyme:__ Enzymes are (mostly) proteins that catalyze biochemical reactions; that is, they increase the rate of a reaction but are not used up in the process.
==Properties: They may consist of a single **polypeptide** chain of amino acids, or they may require an additional chemical called a coenzyme. Many of the **vitamins** as well as several **metals** act as coenzymes.==

Properties: The RNA catalysts called ribozymes are found in the nucleus, mitochondria, and chloroplasts of eukaryotics organisms.
==__Vitamin:__ A vitamin is an organic compound required as a nutrient in tiny amounts by an organism. A compound is called a vitamin when it cannot be synthesized in sufficient quantities by an organism, and must be obtained from the diet. ==

Reviewed by GL

The UN elected the 22th of March as the World Water Day -The oxides reacts with water and form oxoacids -The oxides of the metals or basic oxides react with the water to form hydroxides -Some metals separate into its elements the water in cold and others were doing it to high temperature. -The water reacts with non-metals, especially with the halogens, giving the following compounds -The water forms complex combinations with some you go out, naming hidrates
 * It reacts with the acid oxides
 * It reacts with the basic oxides
 * It reacts with the metals
 * It reacts with the non-metals
 * It joins in you them go out forming hidrates

links: [] http://www.monografias.com/trabajos14/propiedades-agua/propiedades-agua.shtml