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Many synapse components, neural fate and patterning genes, and neurotransmitters are found in both cnidarians and ctenophores, which have nerve nets, but not in sponges, which do not. Ctenophores are currently believed to be the outgroup to cnidarians, bilaterians, and sponges, casting doubt on the origins of nervous systems. What are two plausible scenarios consistent with these observations, and how could one experimentally distinguish between them?
Heavy Metal Songs
Musical compositions characterized by aggressive rhythms, distorted guitars, and themes of rebellion or challenge to societal norms, often associated with the heavy metal genre.
Suicidal Tendencies
A pattern of thoughts or behaviors that indicates a risk for suicide, including ideation or attempts.
Musicians Liable
The responsibility or obligation of musicians, often in legal contexts, regarding their actions, performances, or music production.
Legally Intoxicated
A legal definition regarding the level of alcohol or drugs in one's system that impairs abilities to drive or operate machinery safely as defined by law.
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