Consider the following statements regarding Microplastics:

1. It is defined as plastic less than five millimetres in diameter.

2. Personal care products, cosmetics, textile fibres and air-blasting media are the primary sources of microplastics in aquatic environments.

3. Frogs control insects that cause various diseases in humans like mosquitoes of malaria and dengue are under threat due to it.

How many of the above statements are correct?