Reproductive system and it's functions
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A theory can be best described as an idea that is supported by many different experiments.
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Black death, also known as the bubonic plague was one of the worst pandemics that ever happened, killing around 1/3 of Europe's population. It spread to Europe in the mid 1300's from China.
Black death victims were treated through magic, witchcraft, prayer and other methods. As for the two other options, they used medicine, but not antibiotics and radiation hadn't been discovered yet (it was discovered in the 1900's)
Microscope. You would place the specimen on the glass slide and then slide the glass slide underneath the microscope.
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