What will happen if we kill all the animals?

Killing all animals would disrupt ecosystems, leading to the collapse of food chains and loss of biodiversity. This would result in overpopulation of certain species, such as plants and insects, which could further degrade habitats and affect human agriculture. Additionally, many animals play crucial roles in pollination, seed dispersal, and maintaining ecological balance, so their extinction would have dire consequences for the planet's health and sustainability. Ultimately, this would threaten human survival as well, given our reliance on healthy ecosystems.