A counting agent for the president Election of a USA. A sample countis done to give an indication of the result while the actual counting is happening. The agent is in charge of a polling station, where multiple ballot boxes are used. The agent is instructed to pick out the first 1000 votes cast into every ballot box. Which of the following best describes the sampling plan? 1.None of the other options
2.Cluster
3.Stratified
4.Simple Random

Which of these international trade concepts results in specialization and trade increases in total world output? a) absolute advantage b) balance of payments c) absolute advantage d) international tariffs

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.

The graph shows the populations of two species over time. which type of symbiotic relationship does the graph represent? a. commensal b. mutualistic c. parasitic d. parent-offspring e. predator-prey