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Single cell.
Because living organisms are made of cells.
Neither, alveoli are the air sacs within the lungs in mammals (singular alveolus).
A host.
The nucleus is considered the control center or "brain" of the cell.
The mitochondria
Genotype<3
In singular: Animal Plural: Animaux The animal= L'animal The animals= Les animaux In singular: Animal Plural: Animaux The animal= L'animal The animals= Les animaux In singular: Animal Plural: Animaux The animal= L'animal The animals= Les animaux In singular: Animal Plural: Animaux The animal= L'animal The animals= Les animaux In singular: Animal Plural: Animaux The animal= L'animal The animals= Les animaux
animal's
No. Ecosystem is where the orginism lives. Adaptation is something about the orginism that helps it survive.
the cell is a cell and an animal cell is an animal cell