I just realized that I have a weird little nitpick with the series: As we have seen, at least the Xeno doesn't really sleep in cryo. So did they have all of their specimens in Jars for 30 years? And they all survived? On whatever they've been fed?
I'm fine with the xeno eggs staying fresh, but the ticks, the eye, the flies ...? Are they fifth of tenth generation? How would that have worked? Shouldn't the crew know a lot more about all of them by then? And who took care of them?
It's another problem created by this long cryo-sleep scenario , and by now, I'm wonderung what's gained by it. I mean, the Nostromo was supposed to be out there how long - two or three years, right? Ripley drifting around in Space for 60 years was an accident, and she was shocked when she learned about it.