Explanation:

Invasive alien species :

• An alien species is a species introduced outside its normal distribution. According to experts, alien species become ‘invasive’ when they are introduced deliberately or accidentally outside their natural areas, where they out-compete the native species and upset the ecological balance.
• The most common characteristics of invasive species are rapid reproduction and growth, high dispersal ability, ability to survive on various food types, and in a wide range of environmental conditions and the ability to adapt physiologically to new conditions, called phenotypic plasticity.
• Some of them are Water Hyacinth, Thorn Apple, and Viper grass.