Final answer:
Microwave ovens and fluorescent light fixtures can cause electromagnetic interference that affects data transmissions.
Step-by-step explanation:
Two sources of electromagnetic interference that can affect data transmissions are the microwave oven and the fluorescent light fixture.
A microwave oven produces strong electromagnetic waves as it operates, which can interfere with nearby electronic devices, including data transmissions. Similarly, a fluorescent light fixture emits electromagnetic interference due to the ballast and high-frequency components used to power the lights.