The track coach notices that his star runner is running quicker than ever before, but quickly gets tired and shows evidence of depression after the race. The coach should suspect that the runner might be taking . A. Growth hormones b. Amphetamines c. Protein supplements d. Creatine please select the best answer from the choices provided. A b c d.

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.