Which best represents the reaction of calcium and zinc carbonate (znco3) to form calcium carbonate (caco3) and zinc? ca → znco3 + caco3 → zn ca + znco3 → caco3 + zn caco3 + zn → ca + znco3 caco3 + zn + ca → znco3.

What must students do with the 10 gird-ins on the math section of the psat

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.

An example of a fine motor skill is