Question

photosynthesis is a key term in the article. how does the author refine the meaning of this term over the course of the article? (a) the author refines the meaning by detailing how reactants pass through the chemical processes that give energy for plants and oxygen. (b) the author refines the meaning by comparing how plant and animal cells generate energy. (c) the author refines the meaning by connecting photosynthesis to the process by which blood is transported within the human body. (d) the author refines the meaning through the use of diagrams detailing the absorption of carbon dioxide through plant leaves.

Explanation:

Photosynthesis is a biological process where plants use reactants in chemical - processes to produce energy and oxygen. Detailing these chemical processes would refine the meaning of photosynthesis. Comparing plant and animal cell energy - generation is not directly refining photosynthesis meaning. Connecting it to human blood transport is off - topic. Diagrams of carbon - dioxide absorption alone do not fully refine the meaning as well as detailing the whole chemical process.

Answer:

A. The author refines the meaning by detailing how reactants pass through the chemical processes that give energy for plants and oxygen.