Answer:
Without plants, animals would have no oxygen to breathe and would die. People also depend on plants for food. All animals eat either plants or plant-eating animals. Without plants there would be no food to eat! For people there are three necessities of life: clean air, clean water and healthy food. Because plants produce oxygen, clean and retain water, and plants form the basis of our entire food chain.
I hoped this helped (´・ω・`)