Balanced rock sits on a thin spike of rock in a canyon what forces keep the rock balanced on its tiny pedestal

The authors use the word “backbone” in lines 3 and 39 to indicate that

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.

Essay questions may also be referred to as a. talk questions c. hard questions b. explain questions d. think questions