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Sabías que…
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En muchas familias obreras era indispensable el trabajo de las mujeres y los niños: en la década de 1880 se necesitaban 4 pesetas diarias para afrontar todos los gastos, cuando los salarios oscilaban…
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Variedades diastráticas o sociales. Variedades diafásicas o de registro
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Variedades diastráticas o sociales. Variedades diafásicas o de registro La lengua en la sociedad
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Think about it. The leaves make the food for the plant
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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.
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Learn to discover the starch in a leaf and see how stomata function
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1. Objective: to discover if starch is present in a leaf Plants store the glucose made during photosynthesis as starch. To test this hypothesis, a leaf will be examined for the presence of starch.…
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Think about it. The removal of cell waste
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Remember what you have studied in this section and answer the questions: Why do sponges and coelenterates not need excretory organs? What is the difference between defecation and excretion? Why is more…
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Learn. How to find out the age of a human foetus
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The approximate age of a foetus can be determined by scanning the mother's abdomen with an ultrasound machine. This method is usually used at a clinic to check that a pregnancy is progressing well…
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Choose. Receptors
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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.
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Did you know?
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The mass of an object does not change when you move it from one place to another or take it to the Moon. But weight does vary, because the magnitude of gravity on Earth is not constant at 9.8 m/s2…
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Choose. Increase in heat and temperature
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Choose the correct answer: What is specific heat of a substance? What happens when a substance has a higher specific heat? What does a body with a larger mass need?
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Final self-evaluation T02 04 - Liberal revolutions and nationalist movem...
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Match each definition with the correct concept: The separation of the Church and state. Jacobin law that controlled prices and salaries. Public figure during the Napoleonic period that governed the…
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