Surely this was too soon for it to require additional sustenance already.

Isis meowed loudly, to remind all concerned that she required sustenance as well.

He had done this to insure that the dime on this planet who did require sustenance would have more or less convenient access to it.

Human beings, however, weren't robots and did require sustenance.

Being animals, invertebrates are heterotrophs, and require sustenance in the form of the consumption of other organisms.

She did not require sustenance, yet accepted it.

Since they drink blood, they must be fleshly enough to require sustenance; but, other than that, no one knows much about them.

As you know, I no longer require sustenance or rest.

In case you require sustenance or refreshment before the morning.

My system does not require organic sustenance in this form.