Anticorps et antigènes : modélisation des collégiens

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5ème

La Terre dans le système solaire

La Terre dans le système solaire Quelles sont les principales caractéristiques de notre planète ? I – Les planètes du système solaire Bilan : une planète est un corps sphérique se trouvant en orbite quasi circulaire autour d’une étoile. Le système solaire est composé de 4 planètes avec une surface rocheuse : ce sont les planètes telluriques (Mercure, Vénus, la

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