Which of the values below represents 70 as a percentage of 40.

Technological solutions have good bad effects. what is one bad effect of spraying a chemical pesticide on crops

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

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.