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Blood circulation (II)
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The heart The heart is the organ that pumps blood to all the cells in our body. It is about the size of a closed fist. Its walls are made of muscle tissue. The heart contains four chambers: The two top…
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Answer. Unicellular and multicellular organisms
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Remember what you have studied in this section and answer the questions: What are organisms made up of a single cell called? How do they reproduce? What do we call living things that are made up of many…
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Unit 4: Animal reproduction
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Break off (v): to become separated from the main part of something. bud (n): a group of cells which differentiates and breaks off an animal to create a new individual by asexual reproduction. budding…
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What plants need
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1.1. Plant nutrition Nutrition is all of the processes that living things use to convert the foods they ingest. They transform these nutrients into biomolecules that they need to make cells and tissues.…
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Human reproduction and sexual differences
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Human reproduction Humans start life as a single microscopic cell in the wombs of their mothers. This cell is called a zygote. The zygote is formed by the union of two cells: the ovum (or egg cell) from…
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The senses
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We receive information on what is happening outside our body through our sensory receptors. These receptors are specialised nerve cells that capture stimuli from outside our body. There are different…
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End-of-unit activities - The Earth, a Living Planet
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The existence of water and a protective atmosphere were key elements for the appearance of life on Earth. The first cells appeared 3.5 billion years ago. From these early forms of life, different groups…
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Complete. Cellular respiration
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Complete this text with the correct words: lungs - cellular - bloodstream - carbon dioxide - energy - exhale - blood vessels - heart Blood containing oxygen passes from the to the . The heart pumps the…
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End-of-unit evaluation - The Earth, a Living Planet
EduBook Organización
- 2121 visitas
The existence of water and a protective atmosphere were key elements for the appearance of life on Earth. The first cells appeared 3.5 billion years ago. From these early forms of life, different groups…
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The transport of substances in plants
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- 2015 visitas
2.1. Plant transport systems Plants have two transport systems, one for each type of sap that is transported: Xylem. This system transports raw sap (water and mineral salts) from the root up the stem to…
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