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El léxico español
EduBook Organización
- 2182 visitas
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La literatura en la edad media (II)
EduBook Organización
- 2183 visitas
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The removal of cell waste
EduBook Organización
- 2182 visitas
4.1. What does excretion consist of? Cell activity produces waste products like carbon dioxide or urea. These substances are toxic for the organism if they accumulate. The function of excretion is…
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Think about it. The removal of cell waste
EduBook Organización
- 2184 visitas
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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Work it out. Animal nutrition
EduBook Organización
- 2190 visitas
Remember what you have studied in this section and answer the questions: Is it possible to find a digestive system that does not use mechanical processes? And chemical processes? Explain your answer.…
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Investigate. The germination of pollen grains
EduBook Organización
- 2183 visitas
In this practical, you can see the germination process of pollen grains. Under normal conditions this takes place in the flower's stigma. Equipment A flower, a dropper, a microscope, a paintbrush, a…
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Did you know?
EduBook Organización
- 2182 visitas
In a hermaphrodite animal, the same individual produces eggs and sperm. Cross-fertilisation usually takes place in these animals: two individuals mate and each one behaves like a male and a female at…
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Learn. How to find out the age of a human foetus
EduBook Organización
- 2192 visitas
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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Match. Metamorphic rocks
EduBook Organización
- 2195 visitas
Match each type of metamorphic rock with the rock from which it originates: Quartzite Gneiss Marble Dolomitic marble Chalk