Tiny pollen particles are dispersed in water. Under a microscope, the pollen particles can be observed moving in a random way. What is the cause of this motion?
- AThe pollen particles are being bombarded by the heavier particles of the water.
- BThe pollen particles are being bombarded by the lighter particles of the water.
- CThe temperature of the water is higher than that of the pollen particles.
- DThe temperature of the water is lower than that of the pollen particles.