Fact 1: Aplant requires sunlight to grow. Fact 2: Plants need air, plants need air. Given the two facts above, what two things does grass require?

Choose your answer from:
1). Sand and rocks;
2). Milk and cookies;
3). bloom time;
4). Sun and air;
5). sunlight;
6). Bodily water;
7). nutrients;
8). Darkness and coldness;
Answer:
4).