Evaluación final - Revoluciones liberales y movimientos nacionalistas (1...

Las nuevas ideas ilustradas y el crecimiento económico del siglo XVIII propiciaron una época de profundas transformaciones políticas en Europa. Este proceso se conoce como revolución liberal burguesa. [...]

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Think about it. The leaves make the food for the plant

Compare the functions of a leaf's epidermis with those of your skin. Make a concept map to associate plant parts and cells with each process: transpiration, photosynthesis.

Learn. Spontaneous generation

How did Pasteur prove that the theory of spontaneous generation of living things was false? Why do we need to use heat to sterilise surgical instruments? Explain your answer.

Temperature and insect growth

The body temperature of an insect varies according to the temperature of its surroundings. This is why insects grow more quickly in summer and more slowly in autumn and winter. Each species has its own…

Matter is recycled and energy is lost in ecosystems

When living things die, decomposers use the organic material to obtain energy. In doing this, they turn the organic biomolecules into inorganic material again. The action of decomposers closes the cycle…

Calculate. Matter and its properties (2)

Calculate the mass of water produced when 20 g of hydrogen reacts completely with 160 g of oxygen. g of water.

Answer. Forces

Look at the different formulas and answer the questions: Which forces have the same meaning as F1? Which forces have the same magnitude as F1? Which forces have the same direction as F1?

The reflection of sound

7.1. Reflection of sound Sound is transmitted in a straight line. When it meets obstacles that it cannot cross, like a wall or a rock, it is reflected back in the other direction. Two phenomena caused…