Casos particulares del pronombre

Casos particulares del pronombre El texto

La literatura española en el siglo XIX

Final Autoevaluation 1.02 - Plant nutrition

J. van Helmont's experiment Van Helmont (1577-1644), a Flemish doctor and chemist, thought that in addition to water, air and substances in soil, other elements must be necessary for plant…

Learn. Spontaneous generation - Animal reproduction

In ancient times, many people believed that living things could be created spontaneously from decomposing material. Aristotle stated that flies and mosquitoes were produced spontaneously from mud in…

Analyse. A text

Polyembryony Polyembryony is a type of sexual reproduction in which an embryo fragments into several identical embryos. They each develop independently. The young of each litter are of the same sex, as…

Think about it. The responses of plants

Remember what you have studied in this section and answer the questions: Discuss whether a plant would respond to light if the tips of the stem were cut off. Explain why poinsettias are typical…

Work it out. The natural environment

Remember what you have studied in this section and answer the questions: What environmental conditions prevent the existence of life on the other planets in the Solar System? Why is light a limiting…

Final Autoevaluation T07 03 - Energy inside the Earth

Complete the text using the following words: subduction - edges - Iceland - hot spots - mid-oceanic Most volcanoes are found along the of tectonic plates. This is especially common in areas like ridges…

Choose. Upthrust and buoyancy

Choose the correct answer: What equals the upward thrust experienced by a submerged object in a liquid? What is the apparent weight of an object? What happens if the weight is less than the upward…

Ways to save energy

Look at the pictures and answer the questions. Which of these measures do you apply? Which do you think are the most useful?