Answer:
Single-celled organism are not classified as an animal because animals are multicellular organisms i. e. made of more than one cell while single celled organisms are unicellular organisms i. e. made of one cell. In single celled organisms, one cell perform all activities while in animals special cells are responsible for particular function. There are some single celled organisms are autotrophic while animals are heterotrophic in nature.
All matter is made of indivisible particles called atoms, which cannot be created or destroyed.
Compounds are combinations of atoms of
2 or more elements.
All chemical reactions involve the rearrangement of atoms.
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