Animals: What am I?

I'm yellow and black and I live in a hive. I make something sweet that you love to eat. I can sting you, but I only do it once. What am I?

I start my life as a caterpillar and then I change completely. I have colorful wings and I fly from flower to flower. I drink nectar but I can't sting you. What am I?

I'm small and I have wings, but people don't like me in their houses. I land on food and I can spread germs. I'm very fast and hard to catch. What am I?

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