My favourite subject is biology as in order to answer its puzzles it also requires knowledge of other science subjects such as chemistry, physics and maths.
As a separate subject I enjoy physics the most, but the most interesting bits of science are where it requires more than one subject at the same time to understand. For example, a bit of biology to understand how the body works, and then a bit of physics to understand how you can use technology to help diagnose or treat somebody.
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