Question

1. water changes from a liquid to a vapor during a. precipitation. c. evaporation. b. respiration. d. decomposition. 7. the process of burning fuel, such as oil and coal, is a. combustion. c. decomposition. b. respiration. d. photosynthesis. 8. one of the most common plants in a recently abandoned farm field is a. horseweed. b. young pine trees. c. young oak and hickory trees. d. crabgrass.

Explanation:

• For question 6, evaporation is the process by which water changes from a liquid to a vapor. Precipitation is water falling from the atmosphere, respiration is a biological process in living organisms, and decomposition is the breakdown of organic matter.
• For question 7, combustion is the process of burning fuel. Respiration is a biological process, decomposition is the breakdown of substances, and photosynthesis is the process by which plants make food using sunlight.
• For question 8, crabgrass is a common pioneer species in abandoned farm - fields. Horseweed can also be a pioneer but crabgrass is more common in such disturbed agricultural areas compared to young pine, oak, and hickory trees which take longer to establish.

Answer:

1. c. evaporation
2. a. combustion
3. d. crabgrass