Beets seeds are actually dried fruits that contain one to four seeds. Carrots, dill and fennel seeds are also, technically, dry, single seeded fruits.
Most vegetable seeds are dicots, meaning they contain two (di-) cotyledons (-cots). When they germinate, dicots send up a stem with two cotyledons.
A gardener might mistake this germination as the beginning of life. But in reality, inside even the tiniest, dust like seed is a living plant.
At levels too small for the naked eye, seeds absorb oxygen and give off carbon dioxide. Within their hard coats are enzymes that convert stored energy into something their tissues can use. Seeds breath, eat and maintain a dim spark of life, until the conditions are just right to break the hard, dry coat that protects them.