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The components of air
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2.1. Air: a mixture of gases Air is made up of a mixture of gases. The main gases are nitrogen and oxygen. Other gases such as water vapour, carbon dioxide and ozone are present in smaller quantities.…
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Answer. Animal nutrition
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Look at the picture and answer the questions. How do animals get the energy they need to live? What is the difference between food and nutrient? Each cell in an organism needs nutrients and oxygen to…
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Initial evaluation 3 - The Plant Kingdom
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Complete the text with the missing words: water – non-flowering – ferns – sunlight – mosses – oxygen – multicellular – roots Plants are one of the three great groups of living things. and…
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Think about it. Transport between cells
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Remember what you have studied in this section and answer the questions: Explain to a classmate how the heart works: Where does the circulatory system transport oxygen and carbon dioxide to? Why? Make a…
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The chemical composition of living things
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2.1. Bioelements Bioelements are the chemical elements that form part of all living matter. There are around 70 bioelements, although not all of them are present in all organisms. Bioelements can be…
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Abiotic factors
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2.1. How do abiotic factors affect living things? Abiotic factors determine the distribution, size and number of living things, and even their capacity to reproduce. The most influential abiotic factors…
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Blood circulation (I)
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The circulatory system The circulatory system has two very important functions: It transports nutrients and oxygen to all the cells in our body. It collects the waste products that the cells produce.…
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Interpret. Molecules and crystals
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Look at the pictures and answer the questions: In what way is a sulphur molecule different from a water molecule? In a glass of water, what is the proportion of hydrogen atoms to oxygen atoms? Describe…
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Complete. Plant nutrition
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Copy and complete the sentences: roots chlorophyll carbon phloem carbon dioxide elaborated sap water oxygen xylem Photosynthesis is the process that allows plants to make food from , and . The sunlight…
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