Answer: A closed circulatory system and an excretory system consisting of tubular nephridia
Explanation:
Answer:
Explanation:
If however, the data does not support the hypothesis or refutes it, then the hypothesis is in trouble, and we have to come up with a different hypothesis to explain the observations. If a large body of data supports the hypothesis, then it becomes a theory.
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<span>Mechanical waves....</span>
