The question may sound strange, but I was wondering whether there are animals, plants, insects or other living creatures that, by some standards (heart, breathing, pulse or others) would not fit the definition of life of their respective category, i.e. that could be considered dead?
The more general underlying question (if you've got time to spend answering this) is, of course, how would life be defined in the first place: are there strict standards that are agreed upon in biology? Then how can we account for cases that do not fit that definition (if there are any, of course)?
References (for non-biologists - I am in communication studies) would be welcome, as I am really growing fond of the issue by way of all those zombie movies I've been watching. Thanks a lot.