Yes, microwaving a living thing will likely kill it. Microwaves work by emitting electromagnetic waves that excite water molecules and other polar molecules in food, causing them to vibrate rapidly. This rapid vibration generates heat, which cooks the food.
When a living organism, such as an animal or a plant, is exposed to microwaves, the water molecules inside their cells will also be excited and generate heat. The rapid increase in temperature can cause severe damage to the living cells, leading to cell death and, eventually, the death of the organism.
It is important to note that microwaving living things, including animals and plants, is extremely unethical and inhumane. It is also illegal in many places, as it constitutes animal cruelty and violates the welfare of living beings. Microwaves should only be used for their intended purpose, which is cooking food.