عنوان الموضوع : في حد عنده برجراف قصير عن البيئة للصف الثامن
مقدم من طرف منتديات بيت الامارات النسائي


ابي برجراف قصير في مقدمة وفقرتين عرض وخاتمة


محتاجة ضروري بكرة امتحان




>>>>> ردود الأعضـــــــــــــــــــاء على الموضوع <<<<<
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>>>> الرد الأول :

I NEED 2




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>>>> الرد الثاني :

مرحباً

شوفو هآالتعبير يمكن يفيدكـم



The natural environment, commonly referred to simply as the environment, is a term that
encompasses all living and non-living things occurring naturally on Earth or some region thereof
Pollution is the introduction of contaminants into an environment that causes instability, disorder, harm or discomfort to the physical systems or living organisms they are in.[1] Pollution can take the form of chemical substances, or energy, such as noise, heat, or light energy. Pollutants, the elements of pollution, can be foreign substances or energies, or naturally occurring; when naturally occurring, they are considered contaminants when they exceed natural levels. Pollution is often classed as point source or nonpoint source pollution.
Sometimes the term pollution is extended to include any substance when it occurs at such unnaturally high concentration within a system that it endangers the stability of that system. For example, water is innocuous and essential for life, and yet at very high concentration, it could be considered a pollutant: if a person were to drink an excessive quantity of water, the physical system could be so overburdened that breakdown and even death could result. Another example is the potential of excessive noise to induce imbalance in a person's mental state, resulting in malfunction and psychosis


بآآلتووفيـــج ..!!




__________________________________________________ __________

>>>> الرد الثالث :

تعبير كبير بس يمشي الحال تسلمينــــــــ




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>>>> الرد الرابع :

ههههههههههه .. ربي يسلمك




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>>>> الرد الخامس :

وانا بعد يبت لكم واحد

The environment can play a significant role in the production of phenotypes. However, the developmental
mechanisms by which the environmental agents effect normal development are just becoming known. At least
three paths have been found through which the environment can modify gene activity. The first is the neuroendocrine route. Here, the nervous system monitors the environment and transfers signals to the endocrine system.
The endocrine hormones can then alter gene expression. The second route involves environmental factors that
change the methylation pattern of genes, thereby altering their transcriptional capabilities. The third route involves the direct induction of gene expression in the host by microbial symbionts. The normal regulation of
phenotype production by the environment should be considered a normal component of development and developmental biology




حلو 2 يمكن ايي عنوان ثاني تسلمينــــــــــ







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