1. What are Saturn's rings made of? How did they form?

2. What is Titan? Why are scientists interested in it?

3. Why was Pluto reclassified from a planet to a dwarf planet? (Give two reasons.)

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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.

How do we determine if they are made with matter