There is a significant difference in the percentage of plant species (22%) and animal species (72%). The reasons for this difference are,
1. Adapting of animals in changing environments for survival such as animals and insects have developed into a complex system of emotions and integrated body control. Also, insects have grown to function differently and build life force in different areas compared to other species as they have repetitive body parts with foreign cultures and paired appendages.
2. The Plants do not move like how animals move. Therefore, the animals have acquired many variations as they have moved and adapted to different environments.