Balance environment is useful for both plants and animals for their survival Why
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In summary, the ecological balance brings the existence of the world. Earth's inhabitants such as human beings, plants, animals and other micro living organisms continue to survive. These species get the conducive environment to multiply and thrive. The world gets to produce sufficient food for all species.

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Explanation:

balance between plants & animals is essential because plants are autotrophs , they can make their own food but animals are heterotrophs , they cannot prepare their own food so they have to depend on plants ( autotrophs) for their food.

moreover, to prepare their food plants need C02 , WHICH IS RELEASED IN THE ENVIRONMENT BY ANIMALS ( BY RESPIRATION) & IN TURN THEY RELEASE Oxygen which is essential for the life of animals & also to maintain balance in nature , the number of plants should be equal to the number of animals.