What is 21y -99343nf

I am the boy on the bottom row

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.

What is the leading cause if water scarcity throughout much of the world

Darwin studied two different types of tortoises on the galapagos islands. sort the characteristics based on which tortoise they describe.