صراع البقاء- מלחמת הקיום عندما يعتمد نوعان من الكائنات الحيه على مصدر واحد من الغذاء في بيئتهما فانهما لا بد من ان يتنافسا على نفس المصدر. وفي اغلب الحالات يكون المصدر نوعا من الغذاء
لكن توجد امور اخرى قد تكون مصدرا لهذا التنافس مثل المأوى ,واما... Continue Reading
(ADHمراقبة خسارة الماء مع البول(هرمون ال تتم مراقبة خسارة الماء مع البول بواسطة هورمون ADH (الهورمون المانع للبول-Antidiuretic Hormone ).
يقوم ال ADH بزيادة الامتصاص العائد للماء في أجزاء معينة من النفرون: في الانبوبة الملتوية البعيدة وفي الانابيب الجامعة. ارتفاع تركيز هذ... Continue Reading
Potential energy
Every object in nature that located at certain height and gravity acting on it has potential energy. We can calculate use the equation Up=m*g*h. The energy released when the object falls.In elevating system we use weigh... Continue Reading
Tropical storm formation Picture taken from http://earthobservatory.nasa.gov/IOTD/view.php?id=87314Each year several tropical storms hit Florida, USA, causing damage and sometimes even deaths and injuries.A tropical storm forms when sea water temperature is 26 degrees or hig... Continue Reading
energy What type of energy does the skater possess as he is moving up the track as shown in the picture above?Run the simulation below for help:
Click to Run... Continue Reading
Backgammon Game Consider throwing a coin multiple times. Even huge amount of times. Let's discuss - what would be the number of times you would get a particular side out of the total number of throws?
Let's see that in any occasion of throwing a symmetri... Continue Reading
complex numbers multiplication A сomplex number is represented by z=a+bi , a and b are real numbers and i is the imaginary unit ,satisfying the equation i2 = −1.
For more information about complex numers link to:
http://blossoms.mit.edu/videos/lessons/compl... Continue Reading
About the ocean acidification phenomenon The term 'Climate Change' is a big topic these days. It refers to several related phenomena such as higher temperatures noticed, more droughts, changing rain and snow patterns, melting glaciers, rising sea level and increased ocean acidity.
The ocea... Continue Reading
The magic salt An Temperature after 5 minutes
°
°
0
27
18
cup
B
What can be concluded from these results? Use the video and the simulation below f... Continue Reading
Sea level rise and its impact on Israel’s beach and coastal cliffs. Some 40 percent of the world's population lives within 62
miles (100 kilometers) of seashore, putting millions of lives and billions of
dollars' worth of property and infrastructure at risk.The biggest impact is expected to be on areas situated nex... Continue Reading
Why does Earth have deserts? Take a look at a physical map of the world. You can notice that all deserts on our Earth are located at approximately thirty degrees on either side of the equator.
Learn what is the reason for that phenomenon from the video below ... Continue Reading
planting trees Why do gardeners
prefer to plant trees in silty soil instead of in sandy soil?click here for using the animation.
Select
the correct answer:... Continue Reading
Question in C3 (Advanced) כתוב תוכנית אשר קולטת מערך דו מימדי דינמי בגודל NXN כאשר N חייב להיות מספר חיובי בין 5-8 כולל.
התוכנית תקלוט למערך רק מספרים אי זוגיים.
לאחר הקלט התוכנית תבנה מערך דינמי חדש בגודל NXN שהוא העתק של המערך הקודם רק השור... Continue Reading
Sea level rise risk Sea level is a term describing the altitude of the water at sea(Haifa) picture taken by :dina izGlobal warming due to human activity has countless examples all over the world.Global warming is basically the constant rise of the world average temperat... Continue Reading
Plastic recycling Plastic is manufactured by the polymerization
process, which connects monomers to create polymers. Common types of polymers in
our lives are presented in the table below:
Example... Continue Reading
Multimedia Questions
Inquiry Questions
