Sabías que…

El movimiento a favor de los derechos cívicos de los negros tiene a su máximo representante en Martin Luther King (1929-1968), nacido en Atlanta y pastor de la Iglesia baptista. Este activista fue un…

Final Autoevaluation 4.01 - Animal reproduction

Answer true or false. Only birds are oviparous. Ovoviviparous animals reproduce through internal fertilisation. We talk about incomplete metamorphosis when there is a chrysalis stage. The mating season…

The natural environment

1.1. The energy of the sun and life The ecosphere is a hypothetical zone existing around any star where the temperature allows life to exist. The conditions which make it possible for life to exist on…

Observe. The periodic table and chemical formulas

Look at the photos and answer the questions: Look at figures 1-3. Say which elements are present in each compound and how many atoms there are of each. Which of these compounds is used as fuel?

Sound

6.1. What is sound? Sound is the propagation of vibrations and energy in a straight line and in all directions. It travels from the source of sound to the receptors. Unlike light, sound needs a material…

Complete. The economy expansion

Complete the sentences about economic expansion with the missing words: In the late 19th century, the low price of produced in the Americas caused an agricultural in Europe. The crisis was particularly…

The driving factors behind imperialism

1.1. Europe's dominance In the last few decades of the 19th century, the Second Industrial Revolution transformed the economies of the leading European powers. Great Britain, France, Belgium and…

True/false. Decline of monarchy and dictatorship

Are the following sentences about the decline of monarchy and dictatorship true or false?: After the crisis of 1917, politicians from different parties joined together to combat the post-crisis…

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