I have the two sentences below and I can't seem to figure out which one, in both cases, would be correct. They "sound" equally correct to me.
Sentence 1
We should make patterns that are beautiful and that does not allow for replication to take place.
We should make patterns that are beautiful and that do not allow for replication to take place.
Sentence 2
In the lab, 10 ml of liquid was diluted with 1500 ml.
In the lab, 10 ml of liquid were diluted with 1500 ml.
I was hoping someone could explain which is correct and why.