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Temperature and insect growth
EduBook Organización
- 2360 visitas
The body temperature of an insect varies according to the temperature of its surroundings. This is why insects grow more quickly in summer and more slowly in autumn and winter. Each species has its own…
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The first humans. The Palaeolithic Age
EduBook Organización
- 2358 visitas
1.1. Human evolution About six million years ago in Africa, some primates began to adapt to new climatic conditions. These first hominids evolved over time into human species. The most important changes…
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Helping the world by preserving biodiversity
EducaMadrid Organización
- 6137 visitas
Helping the world by preserving biodiversity Short documentary on biodiversity in the Democratic Republic of Congo and surrounding regions -- here, you'll meet the forest rangers of the Virunga national…
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Summaries - Animals
EduBook Organización
- 2267 visitas
1. Vertebrates Vertebrates are the group which contains the human species. They have an internal skeleton, made of bones. The name comes from the vertebrae, which make up the spine (backbone), which…
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Pollination, fertilisation and the formation of seeds
EduBook Organización
- 2203 visitas
Pollination Sexual reproduction in plants occurs when a spermatozoid meets an ovule. For this to happen, the pollen grains need to travel from the stamens to the pistil. This process of transferring…
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Protecting the environment - The natural environment
EduBook Organización
- 1 lo usan
- 2003 visitas
There are many reasons why we should protect the environment. We should protect the habitat of endangered species, but we should also protect the environment because our future depends on it.…
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Learn. The life cycles of animals - Animal reproduction
EduBook Organización
- 2140 visitas
The term life cycle refers to all the phases that take place throughout the life of a species. If development is direct, the juvenile forms look like the adults. If it is indirect, they undergo…
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The extinction of the dinosaurs
EduBook Organización
- 1874 visitas
In 1980, American scientists proposed that the cause of the extinction of the dinosaurs, which occurred about 65 million years ago, was the result of a meteorite hitting Earth. According to this…
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Geological Time (Part 1) - Geological Time (Part 1)
EduBook Organización
- 1057 visitas
Life on Earth originated about 2 billion years ago, but the earliest good fossils come from the Cambrian period, which began about 570 million years ago. The Cambrian Period The climate at the beginning…
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