Los medios de comunicación

Les perífrasis verbals

Les perífrasis verbals La gramàtica: morfologia verbal

The scientific method - Introduction

5. About the scientific method What method do scientists use to formulate a theory or test a hypothesis? The development of cell theory can be used to explain the stages of scientific inquiry.…

Learn. The different types of respiration - Animal nutrition

Diffusion In unicellular organisms, like the amoeba, respiratory gases are exchanged across the whole surface of the body. These gases then cross the cell membranes by diffusion. Tracheal respiration…

Choose. Receptors

Indicate where these receptors are found in the sense organs: Olfactory cells. Rods and cones. Hair cells. Cells that perceive changes in the position of the head and in balance.

True or false. Earthquakes

Answer true or false: An earthquake last for hours. We feel all earthquakes. Large scale earthquakes can cause huge damage. The hypocentre is the point inside the Earth where the earthquake originates.…

Calculate. Displacement and distance travelled

Look at the diagram and calculate the displacement and total distance travelled in each case d: Displacement d = m. Distance travelled = m. Displacement d = m. Distance travelled = m. Why is…

Calculate. Pressure

Calculate the pressure exerted on the floor a box of mass 150 kg whose base has an area of ​​3 m2: P = Pa

Learn. Ways to save energy - Obtaining and using energy

Ways to save energy Measures for saving energy are the responsibility of both individuals and society in general. This page shows you some of the ways to save energy. To save energy we must avoid Using…

The League of Nations

The League of Nations (LN) was President Wilson's idea, created to guarantee peace and promote cooperation throughout the world. The LN had its headquarters in Geneva, and it consisted of two…