Wiktionary
n. (context biology English) The needs of living organisms required to perpetuate their existence and survival.
Usage examples of "biological imperative".
Biologically co-dependent, over the centuries they've become linked at such a core level that it's become a biological imperative.
He was unable to imagine what she was feeling but clearly she was In the grip of a powerful biological imperative.
He was unable to imagine what she was feeling but clearly she was in the grip of a powerful biological imperative.
The squirming thing in Dmitri's hand was animated by its own biological imperative.
Territorial integrity is an imperative, a biological imperative with atevi.
Ironically, those wretched ancestors had sex only on rare days of ovulation, when they perfunctorily discharged the biological imperative to fertilize, robbed of your leisurely pleasure by their desperate need for swift results.
Both acts were entirely arbitrary, now that they were divorced from any biological imperative, but that only brought them closer to other meaningless pleasures, like music.
The fact that the need was not his own, that it had come from a creature in the grip of a biological imperative, did nothing to alleviate his shame.
What you did, you did from some biological imperative, but I cannot forget that there were alternatives to the approach you took.
They were driven by an intense biological imperative that required them to find more and more space for their progeny.