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Reptiles are cold-blooded, meaning that most species of reptiles are unable to generate their own heat. This requires them to regulate the amount of heat they absorb. One method that reptiles use for thermoregulation, which is the regulation of their body temperature, is to move into the shade or water when their body temperature is high, or to bask in the sun when they are too cold and need
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of the population leaves the habitat for a new one. If the new habitat has different environmental pressures than the previous habitat, this population of butterflies will develop new adaptations in order to survive. For example, if the new habitat is barren and sandy, the butterfly may evolve a new wing color, that will help it blend in with its new environment. In this manner, a new species of butterfly evolves
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The pulse represents the variation in blood pressure from diastole to systole. During diastole blood pressure falls, but increases after systole as the heart pumps more blood into the arteries. You feel this difference when taking your pulse. Doctors use a device called a sphygmomanometer
Difficulty: Middle school
What are blood cells? What do they look like? What functions do they perform? How can I recognize the different categories? This is a short description of the blood cells and includes a simple experiment which allows you to become familiar with the cells of this precious liquid. The blood consists of a suspension of special cells in a liquid called plasma. In an adult man, the blood is about 1
Difficulty: Middle school
The purpose of this experiment is to find out which high energy foods, such as orange juice, affect the blood sugar levels in a person; the amount it affects them plus the time it affects them. The hypothesis of this experiment is that the blood sugar will rise to its highest level in an half hours time and back to normal by one full hours.
Difficulty: Elementary school
You may wish to do this demonstration outside. This apparatus will use air pressure to propel tephra (sand) into the air. A fan disperses the tephra downwind where it accumulates to form a cinder cone. Visibility of the tephra is enhanced if a white sheet or cardboard is used as a backdrop and drop cloth.
Difficulty: High school
Students will determine how and why an egg is able to go into a bottle due to changes in air pressure.
Difficulty: Middle school
Hydroelectric facilities are built at the base of dams to take advantage of the high pressure of the water at the bottom of a reservoir. The water pressure is funneled through a tunnel through the dam called a penstock. The water then is focussed on the blades of a turbine. Water pressure of the water turns the turbine, and the turbine turns a generator making electricity. This simple experiment
Difficulty: Elementary school
Mariotte siphons or Mariotte bottles (figure 1) are devices that provide a constant pressure that will deliver a constant rate of flow from closed bottles or tanks. The flow rate will depend upon the head as defined in figure 1 and not on the height of the free water surface. These devices find many uses where a nonchanging pressure is needed. One application in agriculture is for applying liquid
CategoryBiology > Botany
Difficulty: High school
What is air pressure? Did you know you can make something that will measure air pressure? You can actually do a bit of weather predicting from a simple made-at-home piece of equipment.
Difficulty: Elementary school
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