Answer: temperate, arctic tundra, tropical, arid desert.
Explanation: The overall climate in the United States of America (USA) is temperate, with notable exceptions. Alaska has an Arctic tundra climate, while Hawaii and South Florida have a tropical climate. The Great Plains are dry, flat and grassy, turning into arid desert in the far West.
We would be looking for a rather small country with a relatively population. It would also probably not include land that is relatively uninhabitable: mountains or jungle or deserts.
The correct answer is: Ecuador. Its population is 16 million and the population density is 55 people per square kilometer.
The appropriate answer is A. Photosynthesis is tied to the carbon cycle because it is the process by which plants use carbon dioxide from the atmosphere to make food. The carbon cycle is essentially the movement of carbon between the biosphere, atmosphere, hydrosphere, and lithosphere. Photosynthesis occurs as an interaction between the atmosphere and the biosphere.
