system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What triggers a seed to start growing?

Obviously water, sunlight, and soil conditions are the macro-triggers, if you will. But what happens inside the seed to get things moving?
gpt
Seeds wait to germinate until three needs are met: water, correct temperature (warmth), and a good location (such as in soil). During its early stages of growth, the seedling relies upon the food supplies stored with it in the seed until it is large enough for its own leaves to begin making food through photosynthesis.