Fact 1: Cells cannot survive without oxygen. Fact 2: Plants stabilize soils and oxygenate the atmosphere. Given the two facts above, cells cannot survive without plants replenishing the what?
Options: 1). Energy.; 2). during the day; 3). atmosphere; 4). mountains; 5). rain; 6). heat energy; 7). Energy; 8). streams;
Answer:
3).