Here's a breakdown:

* Seeds contain a tiny plant embryo, which is like a baby plant waiting to grow.

* The embryo has everything it needs to start growing: a tiny root, a stem, and leaves.

* Seeds also have a food source for the embryo to use until it can make its own food through photosynthesis.

* When a seed is planted in the right conditions (water, warmth, and sunlight), the embryo begins to grow and eventually sprouts, becoming a seedling.

* The seedling grows bigger and stronger, developing roots, stems, leaves, and eventually flowers and fruits.

While seeds are the most common way plants grow, there are some exceptions:

* Spores: Some plants, like ferns, reproduce using spores instead of seeds. Spores are much smaller and simpler than seeds.

* Vegetative reproduction: Some plants can reproduce asexually, meaning they don't need seeds. They can grow from cuttings, bulbs, or even runners (like strawberries).

So, the answer is seeds are the most common way plants grow, but there are other methods too!