Answer:
To comprehend what will happen if they cease reproducing, we must first understand why plants and animals require reproduction. Plants and animals reproduce in order to keep their species alive and well on the planet. However, if they cease reproducing, the remaining population will live and die, and there will be no more, and every species will eventually come to an end. And then there will come a day when unicellular organisms will dominate the entire globe, and the earth will be their sole own.
Apart from 'needing plants and animals to eat' (another response), my opinion is that we do not 'need' animals to consume. It's called ecology, and it refers to our interactions with other living things. Plants and other species are required to maintain the planet's healthy equilibrium. In reality, people could cease reproducing and go extinct and have no effect on the earth (well, things would get better; we'd stop robbing the land and resources, emitting toxins into the air, and butchering and killing other species). Other flora and species help to keep this world alive. Look up keystone species on the internet. These are species that have a significant environmental impact and play an important part in preserving the ecological framework of the planet's community of creatures. One of them isn't a human. We humans and other living forms would perish if trees were not present..
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