A Multi-Celled organism has many cells (more than one). Examples would be plants, humans and animals/mammals.
A Single-Celled organism only has one cell that makes up it's entire self. Examples would be bacteria and archaea.
A observation and hypothesis
Answer:
D. by taking in oxygen and cleaning out waste gases like carbon dioxide.
Explanation:
The respiratory system cleans out your carbon dioxide and replaces it with oxygen.
The correct answer is "C". 'Proton'. The number of protons is equal to the atomic numbers.
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Answer:
The last one and the first one.
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Explanation: