Which best describes the physical properties of the earth's core? a)semi-moltenb)water and organic substancesc)a solid lower part and a liquid upper partd)contains volcanic, sedimentary and granitic rocks

In the image, layer a is the topmost layer. layer c contains fossils from the precambrian era. layer b contains dinosaur fossils, and layer a contains fossils of mammals. which two statements are supported by this evidence? 1. mammals lived before the precambrian era. 2. dinosaurs and mammals existed in the precambrian era. 3. dinosaurs evolved after precambrian organisms. 4. precambrian organisms evolved after dinosaurs. 5. precambrian organisms were the first life-forms to become fossilized, according to this sample.

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Which specimen would best be viewed using a compound light microscope?