The answer to this question may vary depending on the specific ecosystem being considered. However, one example of an animal whose absence would have a significant negative effect on many ecosystems is the bee. Bees are crucial pollinators, responsible for pollinating a large percentage of the world's flowering plants, including many crop plants. Their pollination activities directly contribute to the reproduction of these plants, which in turn supports the growth of other plant species, maintains biodiversity, and provides habitat and food for numerous other animals. If bees were to disappear, it would disrupt these ecological processes, leading to a decline in plant diversity, reduced food availability for other animals, and potentially, collapse of various ecosystems.
