Viruses are not always classified as living cells because they cannot live independently. They rely on a host to provide all resources to live, without a host they are in a dormant, near dead like state. Therefore it has to define a virus as dead or alive as it may or may not have a host.
Homogeneous is the answer
The most common antibiotic for infections is penicillin.
Coal is considered a non renewable source because the earth cannot replenish it.
