The hypothesis is that flies and cockroaches have more germs on them than ants or beetles.

You will catch an ant, cockroach, fly, and beetle from the same location and release them onto petri dishes filled with agar. You will measure the size of the bacteria colony that grows in each petri dish over five days.

You will need four petri dishes prepared with agar, four plastic containers, an ant, a cockroach, a fly, a beetle, a ruler, a stopwatch, a clean pair of tweezers, and a marker pen.

The results showed that the petri dishes exposed to the cockroach and the ant had more pronounced bacteria growth compared to the petri dishes exposed to the fly and the beetle. This suggests that cockroaches and ants carry more germs than flies and beetles.

This science project is interesting because it allows students to explore the relationship between insects and germs and how they spread diseases.

Experiment variations include using other types of insects like dragonflies, bed beetles, or spiders. You can also repeat the experiment by capturing flies from various locations like a garbage dump, near animal feces, within the house, or in the garden and compare the amount of germs in them.

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