In rock layers, jellyfish fossils are found lower than trilobite fossils, and trilobite fossils are found lower than ammonite fossils. What can be determined from this information? Trilobites existed before jellyfish and ammonites.
Jellyfish existed before trilobites and ammonites.
Ammonites existed before trilobites and jellyfish.
Jellyfish, trilobites, and ammonites lived together.

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what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.

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