Most ants are infertile females, although the colony does produce new queens and drones, whose functions are exclusively for reproduction. Ants communicate by secreting neurotransmitters to each other, a quick and effective method of relaying commands and information. Healthy ants never try to harm any other part of the colony. The entire ant colony is a single organism, and no one ant could function alone the way the colony can.
Dandelions are solitary.
While bees and the wind will pass reproductive materials between each individual plant, there is no other interdependence. Each plant can grow roots, leaves, stems, and flowers without help from others. In fact, dandelions must compete with each other for the precious resources of soil and sunlight. A successful dandelion will crowd out other plants, dandelions included, and will produce many seeds. Those seeds will grow into more dandelions that will compete with each other as well.