Quantum physics describes the fundamental behavior of particles and is necessary for an understanding of chemistry. There is, therefore, prima facie reason to expect that it bears an important relation to biology. More than finding quantum phenomena that are exceptions to the classical rule, what is needed are plausible hypotheses that, if true, show that life is importantly quantum. Four such hypotheses are considered, of which it is expected that at least one is true: (1) cells are quantum sensors, (2) cells are quantum batteries, (3) brains have quantum stabilizers, (4) humans have an electromagnetic sense. These hypotheses are discussed. Methods for testing them are described, with notes.
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