Because they have us outnumbered! More than 80 percent of all species on Earth belong to this wildly diverse group of creatures, and biologists are discovering new bugs all the time. Each square foot of your backyard is crawling with them: grubs, ants, spiders, beetles, centipedes, and grasshoppers. Your bedroom floor is a habitat for dust mites. You have microscopic bugs clinging to your body right now. Feeling itchy yet? Oh, and think about this next time you squash a bug: They’re crucial to our survival.
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