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Final Autoevaluation 4.08 - Animal reproduction
EduBook Organización
- 4261 visitas
Complete the text about reproduction in mammals and birds. embryo – viviparous – young – milk – egg – mammary glands – oviparous – placenta – nutritious Both mammals and birds tend to…
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End-of-unit activities - The Animal Kingdom (II). Vertebrates
EduBook Organización
- 4153 visitas
There are around 50000 species of vertebrates, classified into five main groups: fish, amphibians, reptiles, birds and mammals. Fish are the most primitive group and they have the highest number of…
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End-of-unit evaluation - The Animal Kingdom (II). Vertebrates
EduBook Organización
- 3798 visitas
There are around 50000 species of vertebrates, classified into five main groups: fish, amphibians, reptiles, birds and mammals. Fish are the most primitive group and they have the highest number of…
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Introduction - The Animal Kingdom (II). Vertebrates
EduBook Organización
- 3691 visitas
There are around 50000 species of vertebrates, classified into five main groups: fish, amphibians, reptiles, birds and mammals. Fish are the most primitive group and they have the highest number of…
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Human reproduction and sexual differences
EduBook Organización
- 3281 visitas
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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Reproduction in flowering plants
EduBook Organización
- 2670 visitas
Some plant species reproduce asexually, but most plants reproduce sexually. A pollen grain fertilises the egg cell inside the ovule. The sexual organs of spermatophytes (flowering plants) are in the…
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The metamorphosis of a butterfly
EduBook Organización
- 2209 visitas
This diagram shows the metamorphosis of a butterfly. After it is born, the butterfly goes through three stages: Larva (caterpillar): it hatches from the egg and begins eating and growing. Pupa…
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Analyse. A text
EduBook Organización
- 2197 visitas
Polyembryony Polyembryony is a type of sexual reproduction in which an embryo fragments into several identical embryos. They each develop independently. The young of each litter are of the same sex, as…
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Learn... Insect metamorphosis
EduBook Organización
- 1854 visitas
There are two different life cycles of insects, although all insects hatch from eggs. In some cases, the insect which hatches simply grows and after several moults, becomes an adult. The majority of…
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