Plz zoom me im 13 i live in canada

Break down of rocks and minerals into smaller particles without a change in composition is called_

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.

Which of the following characteristics of the arctic rabbit is specifically an adaptation to living in the tundra? a. small size b. keen eyesight c. strong legs d. white fur