The correct answer is Animals.
Explanation:
The animal population is 30 times more than plant population on Earth.
On one hand, the animal population is continuously increasing; on the other hand, the plant population is constantly decreasing. This is the main reason for increasing temperature of the Earth, and the Green House Effect.
Reports state that there are about 8 million animal species on Earth; on the contrary, there are only 0.3 million plant species present.
Insecta alone comprises 50% population of the globe.