Among the biotic pollinator, which one are more dominant pollinating agent?

Bees

The most dominant biotic pollinating agent is bees.

Bees are responsible for pollinating about 80% of all flowering plants in the world. They are attracted to flowers by the sweet nectar that they produce. When a bee lands on a flower, it collects pollen on its body. When the bee visits another flower, it transfers some of the pollen from the first flower to the second flower. This process of pollen transfer is called pollination.

Other important biotic pollinators include butterflies, moths, flies, and beetles. These animals are also attracted to flowers by the nectar that they produce. However, they are not as efficient pollinators as bees. This is because they do not have the same brush-like hairs on their bodies that allow them to collect pollen effectively.

Lizards are important pollinators, in some cases replacing birds and insects in many island systems. This ornate day gecko (Phelsuma ornata) on Round Island, Mauritius, hopped from plant to plant, enthusiastically feeding on the nectar of endemic plants, and transporting pollen in the process.