A sample of copper has a mass of 50 g and a volume of 5 cm^3. what is its density?

Explain how you might determine the rate of weathering on a sample rock

Which of the following is a presentation cue? a. crossing your arms b. mumbling c. repeating words d. whistling

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.