El reformismo de Gorbachov

Cuando en abril de 1985 acepté encabezar el Comité Central del PCUS (…), nuestro país se había desgastado en una carrera de armamentos extenuante. [...]

El signo

La comunicación

La comunicación La comunicación

Activitats de síntesi

Activitats de síntesi Oracions subordinades adverbials

Talk about it. Plant nutrition

Where do plants get the substances that they need to carry out their vital functions? Why do plants need the Sun? How does the vital function of nutrition differ in plants and animals? Why are plants so…

Fertilisers

Fertilisers are mixtures of chemical substances, including many biolelements. They are used to enrich the soil and improve plant growth. They usually contain nitrogen, phosphorus, potassium and…

Classify. The sense organs

Classify the organs described below using the two criteria given:

Mycorrhizas, a beneficial association

Certain fungi in the soil live with the roots of the majority of plants in a generally mutualistic association called a mycorrhiza. Mycorrhizas are found in the majority of trees in tropical zones and…

Learn. Biomes - The natural environment. Ecosystems

The name biome is given to zones of the Earth which have similar plant and animal populations. Each biome spreads over a large area, including different continents. On a given continent, there can be…

Complete. The study of earthquakes

Complete the text using the words below: Richter - seismographs - seismograms - seismic - magnitude waves travel through the Earth's interior. The instruments used to measure the waves are called ,…