The force of water against the seed coat causes a root to emerge from a seed.
Most waves are formed from the force of wind against the water.
Waves against the seed coat causes a root to emerge from a seed.
What against the seed coat causes a root to emerge from a seed?
Options:
1: warmth
2: calcite
3: lipids
4: an ion
5: fibrous
6: waves
7: heat
8: acidity