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Au niveau des virus, ce ne sont pas des cellules. On peut retrouver en eux du matériel génétique, ils ont aussi une délimitation (Avec une coque protéique, une membrane...). Or, ils ont besoin d'une machinerie extérieur pour pouvoir se reproduire et donc, se diviser. Ici, si on laisse un virus à l'air libre, alors il ne peut pas se reproduire, mais il peut survivre. Ici, pour se diviser, il a besoin d'une cellule hôte, comme par exemple le Covid-19 !

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