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Francès / Balade sur le bassin d'Arcachon
Xtec Organización
- 949 visitas
Le bassin d'Arcachon. L'ostréiculture. Vocabulaire Epurer : littéralement, rendre pur. Ici, simplifier. Un ostréiculteur : personne qui élève les huîtres. Caillé(e) : sans doute laiteuse.…
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True/false. Mosses and ferns
EduBook Organización
- 2401 visitas
Are the following sentences true or false? The difference between mosses and ferns is that the former cannot do photosynthesis. Mosses and ferns are both non-vascular plants. Mosses and ferns are both…
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Answer. Pollination, fertilisation and the formation of seeds
EduBook Organización
- 2210 visitas
Remember what you have studied in this section and answer the questions: In what two ways can pollen be transferred? What do we call the process where the spermatozoid and ovule meet? What does the…
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Analyse. A text
EduBook Organización
- 1819 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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Pollination, fertilisation and the formation of seeds
EduBook Organización
- 1708 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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Think and answer. Spermatozoids
EduBook Organización
- 1288 visitas
Look at the diagram on the right. It shows the sexual reproduction of Sargasso seaweed, found in the Atlantic Ocean. Each spermatozoid has two small tails to help it swim to the ovules. What do the…