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Fertilisation and the development of the zygote
EduBook Organización
- 2267 visitas
This diagram shows how a fetus is formed. Firstly, a zygote is formed from the fertilisation of an ovum from a woman by a sperm from a man. The zygote then splits into more and more cells. It develops…
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Self-assessment T10 04 - The nervous system
EduBook Organización
- 2197 visitas
Are these sentences true or false? The nervous system consists of special nerve cells called axons. The nerve cells are connected to each other by nerve extensions. In each neuron, the nerve signal…
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The discovery of the cell
EduBook Organización
- 1993 visitas
The discovery of the cell did not occur until after the invention of the microscope, in 1590. In 1665, the English scientist Robert Hooke published the first description of cells when he examined…
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Neurons and nervous actions
EduBook Organización
- 1980 visitas
Neurons The nervous system consists of special cells called neurons (or nerve cells). Each neuron has many short nerve extensions, called dendrites. One of the extensions is longer than the others. This…
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Video: The Central Dogma of Biochemistry
Tiching explorer Organización
- 4849 visitas
The key theme of all of biochemistry is that biological molecules are responsible for the storage and transmission of inherited information, provide the structure with which cells and organisms are…
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Animal reproduction
EduBook Organización
- 11922 visitas
Reproduction is the only vital function that is not needed to keep an individual alive. It ensures the continuation of the species. Although sexual reproduction is a universal characteristic of animals,…
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Tutorial Excel 2010
Tiching explorer Organización
- 31 lo usan
- 5340 visitas
This set of lessons covers the basics of Excel: modifying cells, rows and columns, creating formulas, sorting and filtering data, reviewing and sharing workbooks charts, sparklines, etc... There are…
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Introduction
EduBook Organización
- 5158 visitas
1. From biomolecules to organisms The molecules that make up living things, biomolecules, join together to form large molecules called macromolecules. The next level of complexity is the cell, which is…
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Introduction - Animal reproduction
EduBook Organización
- 1 lo usan
- 3539 visitas
Reproduction is the only vital function that is not needed to keep an individual alive. It ensures the continuation of the species. Although sexual reproduction is a universal characteristic of animals,…
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The simplest invertebrates
EduBook Organización
- 3627 visitas
The most common invertebrates are sponges, cnidarians, flatworms, nematodes, annelids, molluscs, echinoderms and arthropods. 1.1. Poriferans or sponges Sponges are aquatic animals. They act as filters…
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