Answer: The majority of animals on our planet, about 95 percent, do not possess a true backbone and are called invertebrates. It's common knowledge that vertebrates like humans have a complex nervous system that reacts to stimuli, but much less is known about invertebrates like shrimp and insects. While it's somewhat different from that of vertebrates, shrimp do have a central nervous system comprised of four main parts.
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C. Hypothesis
Explanation:
Hypothesis is a proposed explanation for a certain occurrence and when the explanation is conclusive, then it becomes a theory.
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A statute is a law, enacted by the state or federal legislature. Regulations are rules set by agencies that fill in the ambiguous areas of laws.
Well, some theories are stupid and some are valid. First, scientists believe that we (humans) evolved from apes. I don't think that is valid, they have no proof. But I do believe that over time, animals have evolved from ancestors. Say birds didn't have wings, Over time God (or whatever you believe) gave them wings so it would help them. Some of those theories are that what influenced scientific debate.